High School Geometry Vocabulary

Front

Acute Angle

Back

Angle < 90°

Front

Obtuse Angle

Back

Angle > 90°

Front

Right Angle

Back

Angle = 90°

Front

Complementary Angles

Back

Sum = 90°

Front

Supplementary Angles

Back

Sum = 180°

Front

Parallel Lines

Back

Lines never meet

Front

Perpendicular Lines

Back

Lines intersect at 90°

Front

Scalene Triangle

Back

No equal sides

Front

Isosceles Triangle

Back

Two equal sides

Front

Equilateral Triangle

Back

Three equal sides