no 1 dan 2 mohon dibantu

2.
[tex]l = 300\pi \\ r2 - r1 = 2 \\ r3 - r2 = 2 \: .....dst \\ 2\pi(r1 + ... + r5) = 300\pi \\(r1 + ... + r5) = 150 \\ r1 = \frac{130}{5} \\ silahkan \: lanjutkan[/tex]