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= ½ x 22/7 x 21 = 33 cm
r = 21 : 3 = 7 cm
K2 = Π x d
= 22/7 x 7 = 22 cm
K3 = Π x d
= ½ x 22/7 x 7 = 11 cm
K. diarsir = 33 - 22 + 11 = 22 cm
L = Π x r x r
L1 = ½ x 22/7 10.5 x 10.5 = 173.25 cm²
L2 = 22/7 x 3.5 x 3.5 = 38.5 cm²
L3 = 1/2 x 22/7 x 3.5 = 19.25 cm²
L. diarsir = 173.25 - 38.5 + 19.25 = 154 cm²
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