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Kelas 8 MatematikaBab Lingkaran
Keliling
= Keliling 1/2 lingkaran besar + keliling 2 . 1/2 lingkaran kecil + 1,4 m
= (1/2 . π . d1) + (π . d2) + 1,4
= (1/2 . 22/7 . (2,8 + 1,4 + 2,8)) + (22/7 . 2,8) + 1,4
= (11/7 . 7) + 8,8 + 1,4
= 11 + 10,2
= 21,2 m