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1225 = r^2
35 cm = r
d = 2 x 35 = 70 cm
pi = 22/7
3.850 = 22/7 . r^2
brarti r ^2 = 3.850 ÷22/7
r^2 = 3.850 x 7/22
= 1225 cm
r = √1.225
= 35 cm
d = r . 2
= 35 . 2
= 70 cm