Angles of Triangles and Polygons

Front

What is the sum of the interior angles of a triangle?

Back

180°

Front

What is the formula for the sum of interior angles in a polygon?

Back

(n−2)180° where n is the number of sides.

Front

If a triangle has one angle measuring 90°, what type of triangle is it?

Back

Right triangle.

Front

What is the measure of each interior angle of a regular hexagon?

Back

120°

Front

How many sides does a polygon have if the sum of its interior angles is 720°?

Back

8 sides (octagon).

Front

What is the measure of the exterior angle of a triangle?

Back

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

Front

If one angle of a triangle is 66° and another is 48°, what is the measure of the third angle?

Back

66° + 48° + x = 180°; x = 66°.

Front

What is the relationship between the interior and exterior angles of a polygon?

Back

Interior angle + Exterior angle = 180°.

Front

What is the measure of each interior angle of a regular pentagon?

Back

108°.

Front

If a triangle has angles measuring 50° and 60°, what is the measure of the third angle?

Back

70°.