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=(12+15)/2x4
=(27)/2x4
=27x2
=54
= 3 cm
c = 5 cm
a² + b² = c²
b² = c² - a²
b² = 5² - 3²
b² = 25 - 9
b² = 16
√b² = √16
b = 4
t trapesium = b
= 4 cm
L = 1/2 × (a + b) × t
= 1/2 × (12 + 15) × 4
= 27 × 2
= 54 cm²
Jadi luas trapesium tersebut adalah 54 cm²