You know that 3 times 2 is 6 so 30'times 20 equals 60

![\\ \sf{:}\implies side=\sqrt[3]{14}](https://tex.z-dn.net/?f=%5C%5C%20%5Csf%7B%3A%7D%5Cimplies%20side%3D%5Csqrt%5B3%5D%7B14%7D)

Now

Cut it into 10 parts as per question(Open side means five sides hence it will be 5×2=10)

Now divide by previous side

Option D
Answer:i kinda don't understand but i guess you mean sqrt11/2?
Step-by-step explanation:2x^2+11=0 easy move