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Angles and Triangles

TermDefinition
vertex the point where two rays meet
right angle an angle that measures exactly 90 degrees
acute angle an angle that measures less than 90 degrees
obtuse angle an angle that measures greater than 90 degrees
straight angle an angle that measures exactly 180 degrees
vertical angles opposite angles formed by the intersection of two lines
congruent having the same measure
adjacent angles angles that have the same vertex, share a common side, and do not overlap
complementary angles two angles whose measures add up to 90 degrees
supplementary angles two angles whose measures add up to 180 degrees
triangle a geometric figure with three sides and three angles
acute triangle a triangle whose angles all measure less than 90 degrees
right triangle a triangle with one 90 degree angle
obtuse triangle a triangle with one angle measuring greater than 90 degrees
scalene triangle a triangle with no congruent sides
isosceles triangle a triangle with at least two congruent sides
equilateral triangle a triangle with three congruent sides
congruent segments sides with the same length
Created by: Mrs. Hancock