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luas lingkaran = 1/2 X 22/7 X 10,5 X 10,5
= 173,25cm
Jadi 441 + 173,25 = 614,25 cm
L,p = 21x21 = 441
L.l = 1/2 x 22/7 x 10,5 x 10,5 = 173,25
total = 614,25 cm2
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Kll = 21+21+21 + panjang busur ( 180/360 x 22/7 x 21 = 33 cm)
kll = 96 cm.
yeah..