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992=(2x1/2x16x12) + (4x10xt)
992=192+40t
800=40t
T=800/40
T=20cm
= 16 cm : 2
= 8 cm
b = d₂ : 2
= 12 cm : 2
= 6 cm
a² + b² = c²
8² + 6² = c²
64 + 36 = c²
100 = c²
√100 = √c²
10 = c
s = c
= 10 cm
LP = 2(La) + (Ka × t)
LP = 2(1/2 × d₁ × d₂) + ((4 × s) × t)
992 = 2(1/2 × 16 × 12) + ((4 × 10) × t)
992 = 2(8 × 12) + (40 × t)
992 = 2(96) + 40t
992 = 192 + 40t
40t = 992 - 192
40t = 800
t = 20
Jadi tinggi/panjang kayu tersebut adalah 20 cm.
Semoga membantu :)