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Verified answer
Luas segitiga= 1/2 x a x t
= 1/2 x 18 cm x 18 cm
= 162 cm²
Luas trapesium
= 1/2 x t x ( a + b )
= 1/2 x 18 cm x ( 18 cm + 24 cm )
= 9 cm x 42 cm
= 378 cm²
Luas gabungan
= 162 cm² + 378 cm²
= 540 cm²