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r^2 = 3.850 x 7/22
r^2 = 1225
r = akar 1225
r = 35
3850 = × r²
= r²
175 × 7 = r²
1.225 = r²
√1.225 = r
35 = r
⇔ d = 35 × 2 ⇒ 70 cm
semoga bermanfaat... :)