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b = 15 cm
t = 5 cm
L = 1/2 × (a + b) × t
= 1/2 × (11 + 15) × 5
= 1/2 × 26 × 5
= 13 × 5
= 65 cm²
Jadi luas trapesium tersebut adalah 65 cm² (C).
= ( 15 + 11 ) × 5
= 26 × 5 = 130 : 2 = 65 cm 2 ( c ) ...