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L = phi x r²
= 22/7 x 28 x 28
= 22 x 4 x 28
= 2464 cm²
b)
L = phi x r²
= 3,14 x 15²
= 3,14 x 225
= 706,5 cm²
luas = π x r²
luas = 22/7 x 28²
luas = 22/7 x 784
luas = 2464cm²
B. r = 15
luas = π x r²
luas = 3,14 x 15²
luas = 3,14 x 225
luas = 3,14 x 225
luas = 706,5cm²