What is the perimeter of a regular polygon with sides of length 12 cm and internal angles measuring 120° each?
Choose one:
A) 72 cm
B) 108 cm
C) 120 cm
D) 132 cm
E) 144 cm
Sum of all interior angles is given by:   180(n-2) = n is number of sides   180(n-2) = 120*n   from here   n =6   So perimeter becomes 12*6= 
<gadget id="calculator">12*6</gadget>
<output>72</output>
72   answer 72 cm
<result>A</result>
What is the perimeter of a regular polygon with sides of length 12 cm and internal angles measuring 120° each?