Angles of Triangles

Front

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

Back

180 degrees

Front

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

Back

Right triangle

Front

What is the measure of each angle in an equilateral triangle?

Back

60 degrees

Front

In a triangle, if two angles are known, how can you find the third angle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the relationship between the angles in a triangle and the sides opposite those angles?

Back

The larger the angle, the longer the side opposite it.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height

Front

What is the definition of an isosceles triangle?

Back

A triangle with at least two equal sides and two equal angles.

Front

How do you determine if a triangle is scalene?

Back

A scalene triangle has all sides of different lengths and all angles of different measures.

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 a triangle has angles measuring 45 degrees and 45 degrees, what is the measure of the third angle?

Back

90 degrees