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L = πr²
L = 22/7 × 28 × 28 = 22 × 4 × 28 = 88 × 28 = 2464 cm²
b. 1/2 ×14 = 7
L = πr²
L = 22/7 × 7 × 7 = 22 × 7 = 154 cm²
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