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Verified answer
Mapel : MatenatikaKelas : 8
Bab : Lingkaran
____________
1] Luas Lingkaran = 1256 cm²
a] Jari jari Lingkaran
= √[L/π]
= √[1256/3,14]
= √[400]
= 20 cm
b] Diameter
= 2r
= 2(20)
= 40 cm
2] Luas Lingkaran = 154 cm²
a] Jari Jari Lingkaran
= √[L/π]
= √[154 x 7/22]
= √[49]
= 7 cm
b] Keliling Lingkaran
= 2 π r
= 2 x 22/7 x 7
= 44 cm