L = 1/2 . L.Lingkaran besar + 1/2. L.Lingkaran kecil
= 1/2(L.Lingkaran besar + L.Lingkaran kecil)
r besar = 14 cm r kecil = 7
L = 1/2(π.14² + π.7²)
L = 1/2.π(14²+7²)
L = 1/2.π(196+49)
L = 1/2π(245) <= π ≈ 22/7
L ≈ 11/7(245)
L ≈ 11.35
L ≈ 385 m²
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L = 1/2 . L.Lingkaran besar + 1/2. L.Lingkaran kecil
= 1/2(L.Lingkaran besar + L.Lingkaran kecil)
r besar = 14 cm r kecil = 7
L = 1/2(π.14² + π.7²)
L = 1/2.π(14²+7²)
L = 1/2.π(196+49)
L = 1/2π(245) <= π ≈ 22/7
L ≈ 11/7(245)
L ≈ 11.35
L ≈ 385 m²