6-1: Angles of Triangles CFU

Front

What is the sum of the angles in a triangle?

Back

180 degrees

Front

If one angle in a triangle measures 90 degrees, what type of triangle is it?

Back

Right triangle

Front

What do you call an angle that is less than 90 degrees?

Back

Acute angle

Front

What do you call an angle that is greater than 90 degrees but less than 180 degrees?

Back

Obtuse angle

Front

If two angles of a triangle are 30 degrees and 70 degrees, what is the measure of the third angle?

Back

80 degrees

Front

What is an exterior angle of a triangle?

Back

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

Front

What is a remote interior angle?

Back

An interior angle of a triangle that is not adjacent to a given exterior angle.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the relationship between the angles of a triangle and its exterior angles?

Back

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

Front

What is the definition of corresponding angles?

Back

Angles that are in the same position on different parallel lines cut by a transversal.