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= 1/4 × 22/7 × 14 × 14
= 11 × 2 × 7
= 154 cm²
B) L = 3/4 × π × r × r
= 3/4 × 3,14 × 10 × 10
= 3/4 × 314
= 942/4
= 235,5 cm²