Triangle Angle Sum

Front

What is the Triangle Angle Sum Theorem?

Back

The Triangle Angle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

If one angle of a triangle is 50 degrees and another is 60 degrees, what is the measure of the third angle?

Back

70 degrees.

Front

What is the formula to find the measure of an unknown angle in a triangle?

Back

x = 180 - (sum of the known angles).

Front

In a triangle, if two angles are equal, what type of triangle is it?

Back

It is an isosceles triangle.

Front

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

Back

Each angle measures 60 degrees.

Front

If the angles of a triangle are in the ratio 2:3:4, what are the measures of the angles?

Back

The angles measure 40 degrees, 60 degrees, and 80 degrees.

Front

How do you find the missing angle in a right triangle if one angle is 30 degrees?

Back

The missing angle is 60 degrees, since 30 + 60 + 90 = 180.

Front

What is the relationship between the angles in a triangle and the exterior angle?

Back

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

Front

If a triangle has angles measuring 45 degrees and 45 degrees, what type of triangle is it?

Back

It is an isosceles triangle.

Front

What is the sum of the angles in a triangle?

Back

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