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lebar= 9 cm
tinggi = 21-9=12 cm
Luas bangun
=Luas persegi panjang + luas segitiga
=( p × l ) + (½ at)
=(18×9) + (½ × 18 × 12)
=162 + 108
=270 cm²
Lbangun=2×LΔ + Lpersegi
=2×1/2×a×t + p×l
=2×1/2×9×12 + 18×9
=108 + 162
=270cm²