Question

Work out the size of an exterior and an interior angle of a regular 12-sided polygon. Interior = ____ Exterior = ____

Answer 1

$(n-2) \times 180$

$(12-2)\times 180$

$10 \times 180$

$1800$

$1800\div 12$

$=150$

$180-150$

$=30$

The interior angle is 150°, and the exterior angle is 30°.