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54 Cards in this Set
- Front
- Back
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Point
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A point is an exact location in space. A point names a location. Point A.
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Line
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A line is a straight path that extends without end in opposite directions. Line l, or Line BC
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Plane
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A plane is a flat surface that extends in all directions forever. Plane P or Plane DEF
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Segment
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A segment is a part of a line between two endpoints. Line segment GH
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Ray
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A ray is a part of a line that starts at one endpoint and extends forever. Ray KJ
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Angle
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An angle is a figure formed by two rays with a common endpoint called a vertex.
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Right angle
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A right angle is an angle that measures exactly 90 degrees.
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Acute angle
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An acute angle is an angle that measures less than 90 degrees.
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Obtuse angle
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An obtuse angle is an angle whose measure is greater than 90 degrees and less than 180 degrees.
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Complementary angles
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Complementary angles are two angles whose measures add to 90 degrees.
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Supplementary angles
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Supplementary angles are two angles whose measures add to 180 degrees.
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Congruent
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Congruent figures have the same size and shape. The symbol for congruence is equal sign with tilde (~) above .
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Congruent angles
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Congruent angles are angles that have the same measure.
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Congruent segments
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Congruent segments are segments that have the same length.
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Vertical angles
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Vertical angles are a pair of opposite congruent angles formed by intersecting lines.
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Parallel lines
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Parallel lines are two lines in a plane that do not intersect.
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Perpendicular lines
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Perpendicular lines are lines that intersect to form right angles.
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Transversal
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Transversal is a line that intersects two or more lines.
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Triangle
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A triangle is a three
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Equilateral triangle
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An equilateral triangle has 3 congruent sides.
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Isosceles triangle
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An isosceles triangle has 2 congruent sides.
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Scalene triangle
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A scalene triangle has no congruent sides.
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Obtuse triangle
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An obtuse triangle has one obtuse angle.
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Right triangle
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A right triangle has one right angle.
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Acute triangle
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An acute triangle has all acute angles.
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Triangle sum
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The sum of the measures of a triangle is 180 degrees.
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Polygon
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A polygon is a closed geometric figure with at least three sides. A polygon is classified by the number of sides it has.
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Regular polygon
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In a regular polygon, all of the sides and all of the angles are congruent.
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Quadrilateral
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A quadrilateral is a four
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Parallelogram
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A parallelogram is a quadrilateral with two pairs of parallel sides and two pairs of parallel angles.
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rectangle
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A rectangle is a quadrilateral with four right angles. (parallelogram with 4 right angles.)
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Rhombus
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A rhombus is a parallelogram with all sides congruent. (parallelogram with 4 congruent sides.)
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Square
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A square is a quadrilateral with four right angles and four congruent sides. (parallelogram, rectangle, and rhombus.)
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Trapezoid
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A trapezoid is a quadrilateral with exactly two parallel sides.
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Slope
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Slope is the measure of steepness of a line on a graph
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Rise
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Rise is the vertical change when the slope of a line is expressed as the ration rise/run or “rise over run”.
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Run
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Run is the horizontal change when the slope of a line is expressed as the ratio rise/run or “rise over run”.
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Correspondence
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Correspondence is the relationship between two or more objects that are matched. If two polygons are congruent all of their corresponding sides and angles are congruent. In a congruence statement, the vertices in the second polygon are written in order of correspondence with the second polygon.
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Transformation
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A transformation is a change in the size or position of a figure. Types of transformations are translations, rotations, and reflections.
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Translation
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A translation is a movement (slide) of a figure along a straight line.
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Rotation
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A rotation is a transformation in which a figure is turned around a point. A center of rotation is the point about which a figure is rotated.
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Reflection
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A reflection is a transformation of a figure that flips the figure across a line.
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Image
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An image is a figure resulting from a transformation.
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Symmetry
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Symmetry is an exact correspondence of form and configuration on opposite sides of a dividing line or about a center point. Symmetric objects have parts that are congruent.
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Line symmetry
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Line symmetry is when one half is a mirror
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Line of symmetry
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Line of symmetry is the imaginary mirror in line symmetry.
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Rotational symmetry
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Rotational symmetry is when a figure can be rotated less than 360 around a central point and coincides with the original figure.
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Tessellation
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Tessellation is a mosaic pattern or a repeating pattern of plane figures that completely cover a plane with no gaps or overlaps. Fascinating designs can be made by repeating a figure or group of figures. These are used in art and architecture.
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Regular tessellation
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Regular tessellation is a regular polygon repeated to fill a plane. The angles at each vertex add to 360. Three regular tessellations exist – equilateral triangles, squares, and regular hexagons.
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Semi regular tessellation
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Semi regular tessellation is two or more regular polygons repeated to fill the plane and all vertices are identical.
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circle
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set of points in a plane that are a fixed distance from a given point, called the center.
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radius
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connects the center to any point on the circle.
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diameter
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connects two points on the circle and passes through the center.
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circumference
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distance around a circle. C=2*Pi*r or C=Pi*d
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