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35 Cards in this Set
- Front
- Back
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angle
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Two rays that have the same endpoint.
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vertex
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The intersection of the sides of an angle.
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angle side
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One of the rays of an angle.
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ray
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A line segment that has one endpoint.
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line
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Extends into space from a single endpoint.
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line segment
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A piece of a line that has an endpoint on each end.
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right angle
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An angle that measures 90°; a square corner.
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supplementary
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Two angles whose sum is 180°.
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complementary
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Two angles whose sum is 90°.
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congruent
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Two figures that are the same shape and size.
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acute
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An angle whose measure is between 0 and 90°.
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obtuse
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An angles whose measure is between 90° and 180°.
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degree
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How we measure angles. There are 360° (pie slices) in a circle.
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vertical angles
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When two lines cross, the vertical angles share a vertex but not a side.
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parallel
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Two lines in a plane that never intersect.
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transversal
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A line that intersects with two other lines in a plane.
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interior angles
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In parallel lines crossed by a transversal, these are the angles in between the parallel lines.
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exterior angles
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In parallel lines crossed by a transversal, these are the angles outside of the parallel lines.
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corresponding angles
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In parallel lines crossed by a transversal, these are the pairs of angles that are on the same side of the transversal, and one each on the same side of the parallel lines.
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perpendicular
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When two lines or line segments intersect to form a right angle.
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alternate interior angles
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In parallel lines crossed by a transversal, these are the pairs of interior angles that are on opposite sides of the transversal, and one on each of the parallel lines.
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same-side interior angles
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In parallel lines crossed by a transversal, these are the pairs of interior angles that are on the same side of the transversal.
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protractor
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A tool used to measure angles.
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polygon
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Poly = many; gon = sides
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triangle
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A polygon with three sides.
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parallelogram
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A quadrilateral which has both pairs of opposite sides equal.
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quadrilateral
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A polygon with four sides.
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trapezoid
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A quadrilateral that has exactly (only) one pair of parallel sides.
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rectangle
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A quadrilateral with all angles equal.
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square
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A rectangle with equal sides.
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rhombus
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A parallelogram with all sides equal.
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scalene
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No sides equal.
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isosceles
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Two sides equal.
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pentagon
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A polygon with five sides.
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hexagon
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A polygon with six sides.
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