Luas gabungan bangun disamping adalah...dm² a.20 b.25,5 c.30 d.31,5

◆ Ltrapesium = 1/2 x (a + b) x t
→ L = 1/2 x (30 + 60) x 50
→ L = 1/2 x 90 x 50
→ L = 45 x 50
→ Ltrapesium = 2.250 cm²
◆ Lpersegi = s²
→ L = 30²
→ L = 30 x 30
→ Lpersegi = 900 cm²
◆ Lgabungan = 2.250 + 900
= 3.150 cm²
= 31,5 dm²

Jawabannya D