Find the cost of fencing a regular pentagon shaped park of side 230 metre at the rate of ₹30 per metre?

What is the simplified form of square root of 400 to the 100th power ?

The perimeter of △cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.

Are these right ? plus what is the answer for number