Interior and Exterior 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 180 degrees.

Front

What are remote interior angles in relation to an exterior angle?

Back

Remote interior angles are the two interior angles that are not adjacent to the exterior angle.

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 exterior angle and the remote interior angles?

Back

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

Front

How do you calculate the measure of an unknown angle in a triangle?

Back

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

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of the triangle and the extension of an adjacent side.

Front

If angle A is 40 degrees and angle B is 60 degrees, what is angle C in triangle ABC?

Back

Angle C is 80 degrees (180 - 40 - 60 = 80).

Front

What is the formula for finding the sum of the interior angles of any polygon?

Back

The sum of the interior angles of a polygon with n sides is (n-2) * 180 degrees.

Front

What is the definition of an acute triangle?

Back

An acute triangle is a triangle where all three angles are less than 90 degrees.

Front

What is the definition of an obtuse triangle?

Back

An obtuse triangle is a triangle that has one angle greater than 90 degrees.