Angles of Polygons

Find the sum of the interior angles of an octagon.

• 1260

• 1080

• 720

• 980

Find the sum of the interior angles of an 15-gon.

• 1260

• 2340

• 2440

• 1800

Find the sum of the interior angles of an 20-gon.

• 3440

• 3240

• 2440

• 3680

Which of the following is true?

• The number of triangles inside of a polygon is always 2 less than the number of sides

• The number of triangles inside of a polygon is always 2 more than the number of sides

• The number of triangles inside of a polygon is always 1 less than the number of sides

• The number of triangles inside of a polygon is always 1 more than the number of sides

How many sides does a polygon have if the sum of all the interiors is 900?

• octagon

• nonagon

• heptagon

• hexagon

How many sides does a polygon have if the sum of all the interiors is 1800?

• decagon

• nonagon

• dodecagon

• 13-gon

How many sides does a polygon have if the sum of all the interiors is 2340?

• 18-gon

• 15-gon

• dodecagon

• 13-gon

How many sides does a polygon have if a single interior angle measures 108?

• pentagon

• hexagon

• heptagon

• octagon

How many sides does a polygon have if a single interior angle measures 144?

• pentagon

• hexagon

• heptagon

• decagon

How many sides does a polygon have if a single interior angle measures 156?

• 15-gon

• hexagon

• heptagon

• decagon