pake cara ya,,, makasih

L1 = s² = 10 × 10 = 100 cm²
L2 = ½ × ( a + b ) × t
= ½ × ( 10 + 10 + 5 + 5 ) × 8
= ½ × 30 × 8
= 120 cm²
Lttl = 100 + 120 = 220 cm²

8×5=40:2=20
-------~~~-------
10×10=100
20+20+100=140
Maaf kalau salah...