Solving Angles of Triangle

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 an unknown angle in a triangle?

Back

You can find the measure of an unknown angle by subtracting the sum of the known angles from 180 degrees.

Front

If two angles of a triangle are 50 degrees and 60 degrees, what is the measure of the third angle?

Back

The third angle is 70 degrees (180 - 50 - 60 = 70).

Front

What is an equilateral triangle?

Back

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

Front

What is the formula for the exterior angle of a triangle?

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 120 degrees, what can you say about the other two angles?

Back

The other two angles must be acute (less than 90 degrees) because the sum of all angles must equal 180 degrees.

Front

What is the definition of a scalene triangle?

Back

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

Front

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

Back

A triangle is valid if the sum of its angles is exactly 180 degrees.