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luas dinding yg terdalam
L = 3 . 15
L = 45 m²
luas dinding yg terdekat
L = 1 . 15
L = 15 m²
dinding sisi kanan dan kiri sama
di buat bentuk peraegi panjang dan segitiga
L = 50 . 1
L = 50 m²
karena ada 2
L = 2 . 50
L = 100 m²
luas segitiga
L = (2 . 50)/2
karena ada 2
L = 2 . 50
L = 100 m²
total luas yg akan di cat
L = 100 + 100 + 15 + 45
L = 260 m²
1 kaleng bisa cat 10 m²
banyak kaleng
= 260 / 10
= 26 kaleng