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Luas trapesium = d1 × d2= 18 × 18 = 324cm2
Luas trapesium = setengah × (a + b) × tinggi
= setengah × (9 + 18) × 9
= setengah × 27 × 9
=243cm2:2= 121,5cm2
=324cm2 + 121,5cm2
=445,5