Bantu jawab dong kak plis minta tolong banget, bsk di kumpul

4.A L=ABF
=½a.t
½. 30.40=600cm²
L=EFGH
P. L
30.20=600cm²
L=CDE
½at
½. 30.40=600cm²
B. Keliling∆
50+40+30=120cm
Kel. Persegi
2(30+20)=100cm
Total
2.kel∆+kel persegi
2.120+100
240+100
=340cm