Repost:

Sarah has a rectangular corral for her horses. She wants to put new rail fencing all around the corral. What total lenght of fencing will she need.

Description of the corral: in my book it is square and around the square is a length of 28m and inside the square if you go diagonaaly its a lenght of 42m .

I tried and tried I don't get this question please help

http://www.jiskha.com/display.cgi?id=1244694224

3 answers

If it's a square and the perimeter totals 28 m, just multiply 28 by $15 to get the cost before taxes.

If it's a square and EACH SIDE is 28 m, then multiply 28 x 4 x $15.

(If I'm wrong, a math teacher will correct me!)
My problem is more with the diagonal being 42. Using a^2 + b^2 = c^2, the sides would not be 28 if the diagonal was 42.
I'll explain it. There is a square in my book. Outside of the squar one of the sides is 28m. Inside the square going across from one corner to the other is 42m