Hello,

What do you find for BF ?

Use the Pythagorean theorem : hypotenuse˛=side˛+otherside˛

BF˛=AF˛+AB˛

Then, you know that the perimeter will be 5 times BF, as it is a regular pentagon.

For the area, it's 5 times the area of SEF.

You have SR, you have EF, so what is the area of this triangle ?