Question

Which polygon has an interior measure of 900 degrees?
A hexagon
B heptagon
C octagon
D nonagon

Answer 1

Hint...

\[\large (n - 2) \times 180\]

this tells us for a polygon of 'n' sides...the total measure of the interior angles...

so if we need 900

\[\large (n - 2) \times 180 = 900\]
\[\large n - 2 = 5\]
\[\large n = 7\]

Also known as a Heptagon!