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3,14x1/2x10=15,70 cm
800+15,70= 815,70 cm
= 40 cm x 20 cm
= 80 cm²
L₂ = π x r²
= 3,14 x 10² cm
= 3,14 x 100 cm
= 314 cm²
#. L = L₁ + L₂
= 80 cm² + 314 cm²
= 394 cm²
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