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616=22/7 x r²
r²=616 x 7/22
r²=196
r=√196
r=14 cm
d= 2r
d=2(14)
d=28 cm
Jadi,diameter lingkaran tsb adalah 28 cm
616 = 22/7 x r x r
196 = r x r
R = 14cm
Diameter = 28cm