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2πr = 308
2×22/7×r = 308
44/7×r = 308
r = 308:(44/7)
r = 308×7/44
r = 49 cm
L = πr²
L = 22/7×49²
L = 7546 cm²
Jawaban: B
2r = 308 . 7/22
2r = 98
r = 98 : 2 = 49
L = 22/7 . 49 . 49
= 22 . 7 . 49
= 154 . 49
= B.7546