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luas persegi panjang = p.l = (4+4+14) x (7+ 18)= 22 x 25= 550
luas daerah yang diarsir = 550 -154 = 396cm²
2. luas kubus = 28x28 = 784
luas setengah lingkaran = 22/7 x 14² = 616: 2 = 308
luas daerah diarsir = 784 - 308+308 = 784 cm²
3. luas setngah lingkaran 1 = 3,14x 10² =314 :2 = 157
luas stenah lingkkaran 2 = 3,14 x 5² = 78,5 :2 = 39,25
luas daerah yg diarsir = 157 - 39,25 = 117,75 cm²
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