Tolong bantu jawab dong Soal kelas 8

[tex]k = \pi \times d \\ = \frac{22}{7} \times 42 \\ = \frac{924}{7} \\ = 132cm [/tex]
[tex]l = \frac{1}{4} \pi {d}^{2} \\ = \frac{1}{4} \times \frac{22}{7} \times 42 \times 42 \\ = 2.772 {cm}^{2} [/tex]