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cari jari2 lingkaran yaitu r = 1/2 d
r = 1/2(28)
r = 14
sehingga luas lingkaran :
luas = phi.r^2
luas = (22/7)(14)^2
luas = 616 cm^2
keterangan 14^2 = 14 pangkat 2
ditanya: L=?
jawab:
r=14 cm
= 22/7 x 14 x 14= 616 cm