Area = π*d2 / 4
d = 30 cm => area = 706.86 sq cm
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60cm
Diameter = 30cm so radius = 15 cm. Then Area = pi*r2 = 706.9 cm2
d = 9.55 cm
30/pi cm
The diameter of a circle is the distance across it, passing through the center. If the diameter is 30 cm, that means the full width of the circle from one edge to the opposite edge is 30 cm. Therefore, the diameter is simply 30 cm.