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s x s = 1225
s = 35
3,14 x r x r = 1225
r^2 = 390
r = 19,75
3,9 : 7
b. 784
s x s = 784
s = 28
3,14 x r x r = 784
r^2 = 249,6
r = 15,8
3,95 : 7