congruent angles, same size angles, acute angle, an angle less than 90 o, obtuse angle, an angle greater than 90 o, right angle, an angle that measures exactly 90 o, supplementary angles, angles that add up to 180 0, complementary angles, angles that add up to 90 o, acute triangle, a triangle with 3 angles less than 90 o, isosceles triangle, a triangle that has 2 equal sides, scalene triangle, a triangle that has no equal sides, equilateral triangle, a triangle whose sides are equal in length, triangle, 3 sided shape whose angles = 180 o, obtuse triangle, a triangle with one angle greater than 90 o, right triangle, a triangle that has one angle equal to 90 o, degrees, the unit of measure for measuring angles

Geometry terms: angles and triangles

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