Minta tolong sama caranya yah. Maakasih

1/2 × d1 × d2
=1/2 × 24 × 18
=216
jadi isinya yg A.216cm^2
Semoga membantu ^_^

30. L=1/2×d¹×d²
=1/2×18×24
=1/2×432
=a.216 cm²
31. L=Πr²
=3,14×20×20
=3,14×400
=1256cm²