Tolong di jawab ya! Jangan asal-asalan Terima kasih

1. K= πd = 3,14 × 8 = 25,12 m
2. K= πd = 22/7 × 3,5 = 11 cm
3. K= πd
d= K/π
d= 154 / 22/7
= 154 × 7/22
= 7 × 7 = 49 cm
4.
a. Soal kurang jelas
b. L = πr² = 22/7 × 28 ×28
= 22 × 4 × 28 = 2464 cm²