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BANGUN 1 = BELAH KETUPAT
BANGUN 2 = JAJARGENJANG
LUAS 1 :
DIAGONAL 1 × DIAGONAL 2 ÷ 2
5 cm × 5 cm × 5 cm × 5 cm
20 cm ÷ 2 = 10 cm^2.
LUAS 2 :
ALAS × TINGGI
5 cm × 4 cm
20 cm^2
LUAS GABUNGAN =
LUAS 1 + LUAS 2
10 cm^2 + 20 cm^2
30 cm^2.
semoga membantu!