bantu jawab dong no 3 dan 4

3) L1 = p × l
= 22 × 14
= 308 cm²
L2 = ½ × π × r²
= ½ × 22/7 × 7 × 7
= 77 cm²
Lb = 308 - 77 = 231 cm²

4) L1 = ½ × ( a + b ) × t
= ½ × ( 14 + 14 + 3 + 3 ) × 14
= ½ × 34 × 14
= 238
L2 = ½ × π × r²
= ½ × 22/7 × 7 × 7
= 77 cm²
Lb = 238 - 77 = 161 cm²