tolong yakak pakai caraya semagat

maaf ya kalau salah. semoga membantu.

1.Ab²=L
AB=√L
AB=
√2500
=50cm²

2. bagun jajar genjang L=a x t=1000×8=8000cm²
=0.8m²

3 L=((a+b)×t ):2
t=2×L : (a+b)
t= 2× 3060 :(70+100)
t= 6120:170
=36m

4.L=π×r²
=22/7 ×21²
=22/7×441
= 22*63
=1386m²