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Verified answer
Penyelesaian :Tinggi trapesium = a
a = ( Luas × 2 ) ÷ Jumlah sisi sejajar
a = ( 450 cm^2 × 2 ) ÷ ( 20 cm + 30 cm )
a = 900 cm^2 ÷ 50 cm
a = 18 cm
Jadi tingginya adalah 18 cm
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