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Luas Juring = luas lingkaran: 4 = 22/7 x 7x7 :4 = 38,5
luas lingkaran = 1/2 x alas x tinggi
= 1/2x7x7 = 1/2 x 49 = 24,5 cm^2
jadi luas tembereng = 38,5-24,5 = 14 cm2