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= 10 cm x 7 cm
= 70 cm
luas setengah lingkaran = 3,14 x 3,5 pangkat dua
= 38,465 cm : 2
= 19,2325
total luas= luas persegi panjang di kurang luas setengah lingkaran
= 70cm - 19,2325 cm
= 50,7675 cm
maaf ya kalau salah.....