tolong bantu jawab kak, pakai caranya ya kak. besok di kumpul

P = 18 × 3 = 54
L = 12 ×3 = 36
T = 8 × 3 = 24

54 - 36 - 24 = 114

L = ( P × L + P × T + L × T ) × 2
= ( 18 × 12 + 18 × 8 + 12 × 8 ) × 2
= ( 216 + 144 + 96 ) ×2
= 456 × 2
= 912

semoga membantu...^_^