tolong dijawab poinya banyqk lo cara mtk nya kebawah

Nomor 3 b) nomor 4 a) nomor 5 d) nomor 6 c) kalo salah maaf Ya

3) L = ⅔ × π × r²
= ⅔ × 22/7 × 42 × 42
= 3696 cm² (B)

4) L = ¼ × 22/7 × 21 × 21
= 346,5 cm² (D)

5) L = ¾ × 3,14 × 16 × 16
= 602,88 cm² (C)

6) L = 120°/360° × π × r²
= ⅓ × 3,14 × 30 × 30
= 942 cm² (A)