Answer:
30 cm
Step-by-step explanation:
The perimeter of a circle is 2[tex]\pi[/tex]r where r is the radius. Therefore, the perimeter of the semicircle would be [tex]\pi[/tex]r + the diameter (because there is only half of the circle's arc). Using the value [tex]\pi[/tex] = 3 and d (diameter) = 12, the area of the circle would be 3(6) + 12 which is 18 + 12 which is 30 cm.
Hope this helps :)
