The length of the second side is the root number 5+ half of the root number 5 (obtained by Pythagoras or Tan) S2=5*(2/3) square.

So NS = 2n-2 power of 5 * (2/3), so 20 10 power is 40 18 power of 5 *(2/3).

So choose d

I'm going to the top class to encourage the mid-term exam the day after tomorrow!