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keliling lingkaran = 2 x phi x r
= 2 x 22/7 x 7
= 44
maka keliling daerah di asir
= 44 + 28 + 28
= 100
gambar 2 kode (ii)
keliling 1/2 lingkaran = 1/2 x 2 x phi x r
= 1/2 x 2 x 22/7 x 14,5
= 45,57...
maka keliling daerah di asir
45 + 21 x3 = 108 , 57...