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a² = 6² - 3,6²
a² = 36 - 12,96
a² = 23,04
a = √23,04
a = 4,8 m
alas segitiga = panjang persegi panjang = 2 x 4,8 m = 9,6 m
Luas segitiga
L = 1/2 x a x t
L = 1/2 x 9,6 x 3,6
L = 4,8 x 3,6
L = 17,28 m²
Luas persegi panjang
L = p x l
L = 9,6 x 4
L = 38,4 m²
Total Luas
L = 17,28 m² + 38,4 m²
L = 55,68 m²
Biaya pengecatan = 55,68 m² x Rp. 40.000/m²
= Rp. 2.227.200