Angles of Triangles

Front

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

Back

The sum of the interior angles of a triangle is always 180 degrees.

Front

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

Back

It is a right triangle.

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, the angles opposite the equal sides are equal.

Front

How do you find the measure of the third angle in a triangle if you know the other two angles?

Back

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle where all three sides are equal and all three angles are 60 degrees.

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 two angles of a triangle are 45 degrees each, what is the measure of the third angle?

Back

The third angle is 90 degrees.

Front

What is the formula for the area of a triangle?

Back

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle where all three sides and all three angles are different.

Front

How do you determine if a triangle is valid based on its side lengths?

Back

A triangle is valid if the sum of the lengths of any two sides is greater than the length of the third side.