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maka :
K = 2 π r²
94,2 = 2 x 3,14 x r²
94,2 = 6,28 x r²
r² = 94,2 / 6,28 = 15
jadi :
L = π x r²
= 3,14 x 15
= 47,1 cm
22/7 kali 21 kuadrat=22/7 kali 441=1386 cm kuadrat