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### 32 Cards in this Set

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 collinear points that lie on the same line obtuse triangle a triangle in which one of the angles is obtuse reflexive property any line or angle in congruent to itself complementary angles 2 angles whose sum is 90 equiangular triangle a triangle in which all angle's are congruent CPCTC corresponding parts of congruent triangles are congruent median a line segment drawn from any vertex of the triangle to the midpoint of the opposite side noncoplanar points, lines, or segments that do not lie on the same plane acute triangle a triangle in which all angles are acute coplanar points,lines, or segments that lie on the same plane trisect 2 points that divide a segment into 3 congruent segments altitude a perpendicular line segment from a vertex of a triangle to the line containing the opposite side congruent triangles all pairs of corresponding parts are congruent leg the sides that are formed from the right angle line straight, made up of at least 2 points and extends infinitely far in both directions hypotenuse the side opposite the right angle equilateral triangle a triangle in which all sides are congruent supplementary angles 2 angles whose sum is 180 congruent segments or angles that have the same length or measure isosceles triangle a triangle in which at least two sides are congruent right triangle a triangle in which one of the angles is a right angle angle made up of 2 rays with a common endpoint ray made up of points and are straight and begin at an endpoint and extends infinitely far in only one direction perpendicular lines, rays or segments that intersect at right angles obtuse angle an angle whose measure is greater than 90 and less than 180 slope the slope (m) of a nonvertical line, segment, or ray containing (x ,y ) and (x ,y ) is defined by the formula right angle an angle whose measure is 90 noncollinear points that do not lie on the same line bisect a ray that divides an angle into two congruent angles acute angle angle whose measure is greater than 0 and less than 90 scalene triangle a triangle in which no two sides are congruent straight angle an angle whose measure is 180