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b trapesium = 40 cm
t trapesium = 18 cm
a segitiga = 30 - 18 = 12 cm
t segitiga = 40 cm
L gabungan
= L trapesium + L segitiga
= 1/2 × (a + b) × t + 1/2 × a × t
= 1/2 × (24 + 40) × 18 + 1/2 × 12 × 40
= 1/2 × 64 × 18 + 240
= 576 + 240
= 816 cm2