P = 4x - 4
L = 2x - 4
T = 2x + 4
Panjang kerangka balok = 4 (p + l + t)
4 (p + l + t) = 1040
p + l + t = 1040/4
p + l + t = 260
4x - 4 + 2x - 4 + 2x + 4 = 260
8x - 4 = 260
P = 4x - 4
L = 2x - 4
T = 2x + 4
Panjang kerangka balok = 4 (p + l + t)
4 (p + l + t) = 1040
p + l + t = 1040/4
p + l + t = 260
4x - 4 + 2x - 4 + 2x + 4 = 260
8x - 4 = 260
Editor: Mariyani Soetrisno
Sumber: Buku.kemdikbud.go.id