Diketahui luas lingkaran 3.850cm2. berapa diameter lingkaran?

L lingkaran = π × r²
3.850cm² = 22/7 × r²
r² = 3.850cm² ÷ 22/7
r² = 3.850cm² × 7/22
r² = 1.225cm²
r = √1.225cm²
r = 35cm

d = 2r
d = 2 × 35cm
d = 70cm

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Selamat belajar !!!

Luas=π×r²
3.850=22/7×r²
r²=3850: 22/7
r²=1225
r=35
diameter 35×2=70