tolong bantu yg nomernya di buletin

4) L1 = s²
= 20 × 20
= 400 cm²
L2 = ½ × π × r²
= ½ × 3,14 × 10 × 10
= 157 cm²
Lb = L1 - L2
= 400 cm² - 157 cm²
= 243 cm² (B)