Triangle Properties & Theorems Review

Front

What is the classification of a triangle with all angles less than 90 degrees?

Back

Acute triangle.

Front

What is the classification of a triangle with one angle greater than 90 degrees?

Back

Obtuse triangle.

Front

What is the classification of a triangle with all sides of different lengths?

Back

Scalene triangle.

Front

What is the classification of a triangle with at least two sides of equal length?

Back

Isosceles triangle.

Front

What is the sum of the interior angles of a triangle?

Back

180 degrees.

Front

What is the vertex angle in a triangle?

Back

The angle opposite the base in an isosceles triangle.

Front

What is the exterior angle theorem?

Back

The exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Front

If one angle of a triangle is 90 degrees, what type of triangle is it?

Back

Right triangle.

Front

What is the formula to find the area of a triangle?

Back

Area = 1/2 * base * height.

Front

What is a base of a triangle?

Back

Any side of the triangle can be considered as the base.