Question

Luas bangun di samping adalah. . . . .
a. 320 cm²
b. 340 cm²
c. 360 cm²
d. 380 cm²
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Answer 1

Luas total

= luas jajargenjang 1 + luas jajargenjang 2 - 2luas ∆

= (10 × (12 + 6 + 10)) + (10 × (12 + 6)) - 2(½ × 10 × 12)

= (10 × 28) + (10 + 18) - 120

= 280 + 180 - 120

= 340 cm²

• opsi b