Interior angles in Polygons and Exterior angles of triangles

Front

What is the formula to calculate the sum of interior angles of a polygon?

Back

The sum of interior angles of a polygon with n sides is given by the formula: (n - 2) × 180°.

Front

How many sides does a polygon have if the sum of its interior angles is 1080°?

Back

An octagon has 8 sides, and its interior angles sum to 1080°.

Front

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

Back

The sum of the interior angles of a pentagon is 540°.

Front

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

Back

Each interior angle of a regular hexagon measures 120°.

Front

How many sides does a dodecagon have?

Back

A dodecagon has 12 sides.

Front

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

Back

The measure of an exterior angle of a triangle is equal to the sum of the two opposite interior angles.

Front

What is the sum of the exterior angles of any polygon?

Back

The sum of the exterior angles of any polygon is always 360°.

Front

If one interior angle of a triangle is 90°, what are the measures of the other two angles?

Back

The other two angles must sum to 90° since the sum of interior angles in a triangle is 180°.

Front

What is the measure of angle x if the interior angles of a triangle are 60°, 70°, and x°?

Back

Angle x measures 50°.

Front

What polygon has a sum of interior angles of 1620°?

Back

An undecagon has a sum of interior angles of 1620°.