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108=2 (4.3+4.t+3.t)
108= 2( 12+ 7t)
108=24 +7t
108-24=7t
84=7t
t=84/7 = 12 cm
108 m² = 2 × 4m × 3m + ( 2( 4m + 3m) × tinggi)
= 24 m² + ( 14 m × tinggi )
14m × t = 108 m² - 24 m²
= 84 m²
tinggi = 84 m² ÷ 14 m
= 6 m
maaf kalau salah