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73 Cards in this Set
- Front
- Back
two angles that share a common vertex and a common side between them
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adjacent angles
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a quadrilateral with two pairs of parallel sides
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parallelogram
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a triangle with the degree bigger than 90 degrees
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obtuse
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a parallelogram with four right angles
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rectangle
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a triangle in which all angles are equal.
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equiangular
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if line segment of any two interior points is completely inside figure
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convex
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region inside an angle
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interior
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in a regular n-gon, any angle with vertex at the center of a regular polygon and sides containing adjacent vertices of the polygon
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central angle
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the union of two rays that have a common endpoint
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angle
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a diameter divides a circle into two parts
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semicircles
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has 8 sides
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octagon
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a triangle with a 90 degree angle
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right
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the sum of the measures of two angles is 180 degrees
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supplementary angles
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two lines that intersect to form right angles
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perpendicular lines
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an angle whose measure is 90 degrees
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right angle
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an angle whose measure is betwwen 90 and 180 degrees
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obtuse
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two lines that meet intersecting planes form a straight line
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intersecting lines
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has six sides
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hexagon
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a triangle in which at least two sides are equal
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isosceles
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a triangle in which all sides are equal
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equilateral
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has an endpoint and is extended indefinetly in one direction
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ray
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a chord that passes throught the center
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diameter
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a triangle with no sides equal
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scalene
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has four sides
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quadrilateral
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In a regular n-gon:
each interior angle has a measure (n-2)x180/n. each exterior angle has measure 360/n each central angle has measure 360/n |
theorem: angle measure in a regular n-gon
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a tool used to measure angles
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protractor
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can be drawn without lifting a pencil and without passing through any point twice
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simple curve
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the exterior and the interior of a simple closed curve
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regions
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the rays forming an angle
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sides
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a quadrilateral with two distinct pairs of congruent adjacent sides
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kite
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point M is between points A and B such that M is the same distance from A and B
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midpoint
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a set of points that a pencil can trace without lifting until all points are covered
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curve
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a quadrilateral with exactly one pair of parallel sides
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trapezoid
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the sum of the measures of the interior angles of any n-gon is (n-2) 180 degrees
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theorem: sum of the interior angle measures of a general polygon
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refers to a line that intersects (touches) the circle in only one point
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tangent
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a dot
Always with capital letter A, B,C |
point
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formed by the intersection of two flat surfaces and extends indefinitely in both directions a line can be divided into three parts: point, and two-half lines
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line
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part of a line, has two end points
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line segment
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distance of a line segement
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length
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similar to a piece of pie
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sector
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has 10 sides
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decagon
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points that lie on the same line
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collinear points
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two angles such that the sides of one angle forms the sides of the other angle.
Only share a common vertex. Have equal measures. |
vertical angles
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A simple closed plane curve seperates the plane into three disjoint subsets: the curve itself, the interior, and the exterior
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Jordan curve theorem
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an angle whose measure is 180 degrees
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straight angle
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region outside an angle
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exterior
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consists of two endpoints and all points on the circle between these endpoints
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arc
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has seven sides
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heptagon
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has the same starting and ending point and drawn without lifting a pencil
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closed curve
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refers to a line that intersects the circle in two pints
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secant line
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two segments have the same length
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congruent
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the set of points in a plane, each of which is the same distance from a fixed point the fixed point lies in the interior and is called the center
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circle
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has three sides
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triangle
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1)the sun of the measures of the exterior angles of a convex polygon is 360 degrees
2) the sum of the measures of the interior angles of a conves n-gon is (n-2) 180 degrees |
theorem: sums of the angle measures in a convex polygon
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an angle whose measure is between 0 and 90 degrees
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acute
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two or more planes that never meet
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parallel planes
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a parallelogram with all sides having equal length
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rhombus
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segments whose endpoints both lie on the circle
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chords
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a rectangle with all sides having equal length
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square
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a polygon with all sides equal and all angles equal
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regular polygon
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a figure that is not convex
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concave
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a flat surface
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plane
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three lines intersect in one point
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concurrent ~
= |
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an angle with the measure greater than 180 but less than 360 degrees
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reflex
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two or more lines that lie in the same plane and never meet
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parallel lines
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simple closed curve made up of only straight line segments are called sides.
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polygon
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is defined to be 1/360 of a complete rotation
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one degree
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the common endpoint of an angle
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vertex
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a triangle that is less than 90 degrees
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acute
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the sum of the measures of two angles is 90 degrees
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complementary angles
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two angles that have the same measure
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congruent angles
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has 9 sides
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nonagon
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has five sides
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pentagon
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