Angle Measures 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 do you call a triangle with all sides of different lengths?

Back

It is called a scalene triangle.

Front

What is the value of x if one angle is 50 degrees and another is 60 degrees?

Back

x = 70 degrees (because 180 - 50 - 60 = 70).

Front

What is the value of x if two angles of a triangle are 45 degrees each?

Back

x = 90 degrees (because 180 - 45 - 45 = 90).

Front

What is an isosceles triangle?

Back

An isosceles triangle has at least two sides that are equal in length.

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 30 degrees and 60 degrees, what is the third angle?

Back

The third angle is 90 degrees (because 180 - 30 - 60 = 90).

Front

What is the relationship between the angles in a right triangle?

Back

In a right triangle, one angle is 90 degrees, and the sum of the other two angles is 90 degrees.

Front

What is the formula to find the missing angle in a triangle?

Back

The formula is: Missing angle = 180 - (sum of the other two angles).