Intro. to Chapter 4 Vocab.

Front

Acute Triangle

Back

3 acute angles

Front

Obtuse Triangle

Back

1 obtuse triangle

Front

Right Triangle

Back

1 right triangle

Front

Equiangular Triangle

Back

3 congruent angles

Front

Equilateral Triangle

Back

3 congruent sides

Front

Isosceles Triangle

Back

2 congruent sides

Front

Scalene Triangle

Back

No congruent sides

Front

Triangle Angle Sum Theorem

Back

The sum of the measures of the angles of a triangle is 180 degrees.

Front

Exterior Angle Theorem

Back

An exterior angle is formed by extending any one side of the triangle. (An exterior is always equal to the sum of the two non-adjacent interior angles.)

Front

Isosceles Triangle Theorem

Back

If two sides of a triangle are congruent, then the angles opposite those sides are congruent.