Find the sum of the interior angles of a decagon.

Find the size of an interior angles of a regular decagon.

The angles of a pentagon are  $x°, x°+15°, x°+20°, x°+20°$ and $x°+25°$. Find the size of the angles.

The interior angle of a regular polygon is $150°$. Find the number of sides of the polygon.

Each interior angle of a regular polygon is $165°$. Find the number of sides of the polygon.

Each exterior and interior angles of a regular polygon were $2\mathrm{x}°$ and $\mathrm{x}°$.

Find the size of each exterior and interior angles.

Each exterior and interior angles of a regular polygon were $2\mathrm{x}°$ and $\mathrm{x}°$. Find the number of sides of the regular polygon.

Each exterior and interior angles of a regular polygon were $3\mathrm{x}°$ and $\mathrm{x}°$.

Find the size of each exterior and interior angles.

Each exterior and interior angles of a regular polygon were $3\mathrm{x}°$ and $\mathrm{x}°$.

Find the number of sides of the regular polygon.