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luas = 1/2 πr^2
= 1/2 x 22/7 x 14^2
= 308 cm2
untuk luas jajar genjang
luas = alas x tinggi
= 28 x 15 = 420 cm2
maka luas gabungan
luas 1/2 lingkaran + luas jajargenjang
= 308 + 420 = 728 cm 2