GEOMETRY 4.2 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 measures 90 degrees, what type of triangle is it?

Back

It is a right triangle.

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

How do you find the measure of a missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

If angle A measures 45 degrees and angle B measures 55 degrees, what is the measure of angle C?

Back

Angle C measures 80 degrees.

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

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 angle P measures 60 degrees, what is the measure of angle Q if triangle PQR is isosceles with PQ = PR?

Back

Angle Q also measures 60 degrees.

Front

What is the definition of a triangle?

Back

A triangle is a polygon with three edges and three vertices.