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308 = 22/7 × r²
r² = 308 × 7/22
r² = 14 × 7
r² = 98
r = √98
r = 7√2 cm
d = 7√2 × 2
d = 14√2 cm
d = 140√2 dm
308=22/7×r^2
308/22/7=r^2
308×7/22=r^2
akar 98=r^2
7 akar 2=r
Diameter=2×r
Diameter=2×7 akar 2
Diameter=14 akar 2