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308 x 7/22 = 98cm
Luas Lingkaran = phi x r x r
22/7 x 49 x 49 = 7546 cm²
308=2×22/7×r
154=22/7×r
154×7/22=r
r=49 cm
L=πr²
=22/7×49×49
=7546 cm²