1/2 x a x t = 160 a x t = 320 4/5 t x t = 320 4/5 t² = 320 t² = 320 x 5/4 t² = 400 t = 20 cm ⇒ tinggi a = 4/5 t = 4/5 x 20 = 16 cm ⇒ alas 5. L₁ : L₂ = 3 : 4 1/2t a₁ : 1/2 t a₂ = 3 : 4 a₁ : a₂ = 3 : 4
6. a. berat cat = L x 0,5 = [(10 x 4) + (1/2 x 10 x 2,5)] x 0,5 = [ 40 + 12,5 ] x 0,5 = 26,25 kg
b. biaya = berat cat x 25000 = 26,25 x 25000 = Rp 626.250,-
4t = 5a
a = 4/5 t
1/2 x a x t = 160
a x t = 320
4/5 t x t = 320
4/5 t² = 320
t² = 320 x 5/4
t² = 400
t = 20 cm ⇒ tinggi
a = 4/5 t
= 4/5 x 20
= 16 cm ⇒ alas
5. L₁ : L₂ = 3 : 4
1/2t a₁ : 1/2 t a₂ = 3 : 4
a₁ : a₂ = 3 : 4
6. a. berat cat = L x 0,5
= [(10 x 4) + (1/2 x 10 x 2,5)] x 0,5
= [ 40 + 12,5 ] x 0,5
= 26,25 kg
b. biaya = berat cat x 25000
= 26,25 x 25000
= Rp 626.250,-