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3850= 22/7×r²
3850× 7/22= r²
1225=r²
35= r
d= 2 . r = 2 . 35 = 70 cm
itu menurutku, kalau salah mohon koreksinya ya
3850 = 22/7 . r²
r² = 3850 x 7/22
r² = 175 x 7
r = √1225 = 35
d= 2r
= 2 x 35
= 70 cm