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= 22 . 28 = 88cm
7
panjang busur = 72°
k. lingkaran 360°
panjang busur = 1°
88cm 5°
panjang busur = 88cm
5°
panjang busur = 17,6cm
sudut = 72/360
= 1/5
busur = 1/5 x 2 x π x r
= 1/5 x 22/7 x 14
= 1/5 x 44
= 8,8 cm