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maka :
1. L = π x r²
= 22/7 x 42²
= 5544 cm²
2. L = π x r²
= 22/7 x 63²
= 12.474 cm²
3. L = π x r²
= 22/7 x 28²
= 2.464 cm²
4. L = π x r²
= 22/7 x 14²
= 616 cm²