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D = 28 CM. maka r = 14 cm
sudut y dobentuk = 72
maka :
panjang busur = 72/360 x 2 x 22/7 x 14
panjang busur = 1/5 x 22/7 x 14
panjang busur = 8,8 cm
sudut = 72
panjang busur = 72/360 x 2 x 22/7 x 14
= 1/5 x 2 x 22 x 2
= 17, 6 cm