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= 20 cm × 20 cm ÷ 2
= 200 cm2.
Luas trapesium
= [(20cm + 25 cm) × 12] ÷ 2
= 270 cm2.
Luas seluruhnya
= 200 cm2 + 270 cm2
= 470 cm2.
Jawabannya : A. 470 cm2