Angle of Triangles and Polygon

A polygon has 8 sides. What is the sum of its interior angles?

A polygon has 13 sides. What is the sum of its interior angles?

What is the sum of the interior angle measures of a pentagon?

Two angles of a triangle measure 40° and 70°. What is the measure of the third angle of the triangle?

A polygon has 12 sides. What is the sum of its interior angles?

Determine the number of triangles formed by drawing the diagonals from one vertex in the octagon.

• 6

• 7

• 8

• 10

Why are these Triangles called Right Triangles?

• They have 3 right angles

• They have 2 right angles

• They have 1 right angle

• They have 0 right angles

How many sides does a Triangle have?

• 4

• 3

• 2

• 6