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3850 cm2 = 22/7 . r²
3850 . 7/22 = r²
1225 = r²
35 cm = r
Jadi, diameter lingkaran = 2 x 35 cm = 70 cm
Maaf ya saya salah, saya khilaf ._. Kurang teliti menjawabnya tadi malam :(
Saya mohon maaf sebesar2nya :(
r^2 = L : phi = 3850 : 22/7 = 3850 x 7/22 = 1225
r = akar dari 1225 = 35
diameter lingkaran = 2 x 35 = 70 cm