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diameter = 28 cm
Luas = 1/2πr² = 1/2 x 22/7 x 14² = 308
keliling = 1/2πd + d = 1/2 x 22/7 x 28 + 28 = 44 + 28 = 72
diameter = 28 cm
luas = Πr² = 22/7.14.14 = 44.14 = 616cm²
keliling = 2Πr = 2.22/7.14 = 2.44 = 88cm