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22/7.r².5=770
r²=49
r=7
maka jari jarinya adalah 7
770 = 2 x 22/7 x r x5
770 = 10 x 22/7 x r
77 = 22/7 x r
r = 77 / 22/7 = 77 x 7/22 = 24,5 cm