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80 Cards in this Set
- Front
- Back
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the mathematics of the properties and relationships of points, line, angles, surfaces, and solides. the study of the "earth's measure"
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Geometry
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has no length or width, only position
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point
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an infinite set of points forming a straight path extending in two directions
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line
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a part of a line that has one endpoint and extends indefinitely in one direction
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ray
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a part of a line defined by two endpoints
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line segment
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a perfectly flat surface that extends in all direction without end
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plane
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the union of two rays with a common endpoint
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angle
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the union of two half-planes with a common edge
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dihedral
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to have equal measure
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congruent
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to divide into two congruent parts
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bisect
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the point in the exact middle of a segment
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midpoint
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a ray that separates and angle into two congruent angles
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angle bisector
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two tools used to do constructions
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compass and straightedge
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two tools used to measure and draw
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ruler and protractor
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a point at which two lines meet to form an angle
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vertex
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a unit of angle measure
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degree
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an angle that is equal to 90 degrees
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right angle
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an angle that is less than 90 degress
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acute angle
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an angle that is more than 90 degrees
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obtuse angle
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an angle that is equal to 180 degrees
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straight angle
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an angle greater than 180 degrees
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reflex
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two angles whose sum is 90 degrees
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complementary angle
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two angles whose sum is 180 degress
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supplementary angle
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the opposite angles formed whe two lines intersect
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vertical
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two angles with a common side and common endpoint
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adjacent
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formed by two adcacent, supplementary angles
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straight line
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formed by two congruent, supplementary angles
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right angles
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the perpendicular distance from a vertex to the opposite side of a plane figure
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altitude
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two lines in the same plane that do not intersect
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parallel
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two lines (not in the same plane) that do not intersect
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skew
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two lines (in the same plane) the meet to form right angles
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perpendicular
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a line that form a right angle with a line segment and divides that line segment into two congruent parts
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perpendicular bisector
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a line that intersects two or more lines
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transversal
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a triangle with 3 congruent sides
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equilateral triangle
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a triangle with at least 2 congruent sides
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isosceles triangle
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a triangle with no sides congruent
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scalene triangle
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a triangle with one right angle
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right triangle
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a triangle with 3 acute angles
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acute triangle
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a triangle with one obtuse angle
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obtuse triangle
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a many sided closed figure
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polygon
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a polygon with all interior angles less than 180 degrees
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convex
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a polygon with one or more diagonals that have points outside the polygon
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concave
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connects two vertices of a polygon that are not endpoints of the same side
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diagonal
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polygon with 3 sides
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triangle
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polygon with 4 sides
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quadrilateral
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polygon with 5 sides
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pentagon
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polygon with 6 sides
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hexagon
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polygon with 7 sides
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heptagon or septagon
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polygon with 8 sides
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octagon
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polygon with 9 sides
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nonagon
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polygon with 10 sides
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decagon
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polygon with 11 sides
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unagon
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polygon with 12 sides
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dodecagon
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polygon with n- sides
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n-gon
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a polygon with congruent angles and congruent sides
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regular polygon
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a quadrilateral with opposite side parallel
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parallelogram
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a quadrilateral with opposite sides congruent
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parallelogram
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a quadrilateral with only one pair of parallel sides
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trapezoid
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a parallelogram with one right angle (by definition)
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rectangle
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a parallelogram with all side congruent
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rhombus
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a rectangle with all side congruent
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square
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a rhombus with all right angles
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square
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the distance around a circle
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circumfrence
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the set of all points equidistant from a given point in a plane
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circle
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the set of all points equidistant from a given point in space
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sphere
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a line segment form the center of the circle to a point on the circle
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radius
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a line segment with both endpoints on the circle
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chord
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a chord that passes through the center of the circle
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diameter
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an angle that has its vertex at the center of the circle
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central angle
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an angle that has its vertex ON the circle
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inscribed angle
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the part of the circle between any two of its points
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arc
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figures that hae the same shape and may or may not have the same size
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similar
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a rule for moving every point in a plane figure to a new location
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transformation
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a "slide" transformation
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translation
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a "roll" or turn transformation
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rotation
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a "flip" or reverse image transformation
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reflection
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a transformation that moves a figure and changes its size to create a similar figure
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dilation
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a figure that rotates onto itself before turning 360 degrees has__________
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point symmetry
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a line that divides a figure into two congruent halves that are mirror images of each other
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line of symmetry
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touching at only one point
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tangent
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