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21 Cards in this Set
- Front
- Back
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complementary angles
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two angles whose sum is 90˚
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supplementary angles
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two angles whose sum is 180˚
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vertical angles
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opposite angles formed by intersecting lines; are always congruent
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congruent angles
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angles with the same measure
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isosceles triangle
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must have at least two congruent sides and angles
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equilateral triangle
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all sides (and angles) are congruent; angles measure 60˚
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equiangular triangle
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all angles (and sides) are congruent; angles measure 60˚
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convex polygons
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a polygon whose diagonals connecting any two vertices are inside the polygon
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concave polygon
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a polygon with at least one diagonal connecting two vertices that is outside the polygon (at least one pair of sides appear to "cave" in)
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regular polygon
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a polygon with all congruent sides and angles
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similar triangles
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triangles with the corresponding angle measures but lengths of sides differ
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indirect measurement
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finding missing measurements using similar figures or without measuring
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perpendicular lines
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intersecting lines that form 90˚angles
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parallel lines
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nonintersecting lines that are equidistant in the same plane
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transversal
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a line that intersects one or more lines
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interior angles
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angles formed inside parallel lines when cut by a transversal
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exterior angles
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angles formed outside parallel lines when cut by a transversal
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alterante interior angles
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congruent angles inside the parallel lines that are on opposite sides of the transversal and opposite position of the parallel lines
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alternate exterior angles
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congruent angles outside the parallel lines that are on opposite sides of the transversal and opposite position of the parallel lines
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corresponding angles
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congruent angles found on the same side of the transversal and same position relative to the parallel lines
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sum of interior angles formula
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S = 180(n - 2)
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