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R1 = 2/3 x 42
R1 = 28
L1 = 1/2 π x R1² L2 = 1/2 π x R2²
L1 = 1/2 x 22/7 x 28 x 28 L2 = 1/2 x 22/7 x 42 x 42
L1 = 22 x 2 x 28 L2 = 22 x 3 x 42
L1 = 22 x 56 L2 = 22 x 126
L1 = 1232 cm² L2 = 2772 cm²
L = L2 - L1
L = 2772 - 1232
L = 1540 cm²
b.485 cm2
c.585 cm2
d.685 cm2