tolong bantu diselesaikan kk

4. V = La x t = x² t
500 = x² t
t = 500/x²

Lp = La + 4 Luas sisi tegak
Lp = x² + 4 x t
Lp = x² + 4 x (500/x²)
Lp = x² + 2000/x
Lp' = 2x - 2000/x²
2x = 2000/x²
x³ = 1000
x = 10 m

t = 500/x² = 500/100 = 5 m

Ukuran Balok ⇒ 10 m x 10 m x 5 m

5. L = x y
900 = x y
y = 900/x

K = 4x + 3y
K = 4x + 3(900/x)
K = 4x + 2700/x
K' = 4 - 2700/x²
4 = 2700/x²
x² = 675
x = 15√3 m
y = 900/x = 900/(15√3) = 20√3 m