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Verified answer
Luas 1 buah layang2 :D1 = 45 cm
D2 = 30 cm
L = 1/2 x D1 x D2
L = 1/2 x 45 cm x 30 cm
L = 675 cm²
Luas 8 buah layang2 :
L = 8 x 675 cm²
L = 5.400 cm²
Luas kertas :
p = 120 cm
l = 80 cm
L = p x l
L = 120 cm x 80 cm
L = 9.600 cm²
Luas kertas yg tidak terpakai
L = 9.600 cm² - 5.400 cm²
L = 4.200 cm²