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L = π × r²
= 3,14 × 25 × 25
= 1962,50 cm²
K = 2 × π × r
= 2 × 3,14 × 25
= 157 cm
2) r = 5 cm
L = π × r²
= 3,14 × 5 × 5
= 78,5 cm²
K = 2 × π × r
= 2 × 3,14 × 5
= 31,4 cm