Answer:Therefore, Shar needs 30 feet of fencing for the entire animal pen. So the answer is 30 feet.
Explanation:
To find the length of the third side, we can use the Pythagorean theorem, which states that for a right triangle with legs a and b, and hypotenuse c:
a^2 + b^2 = c^2
In this case, the shortest side is 5 feet and the longest side is 13 feet, so we can set up the equation:
5^2 + b^2 = 13^2
Simplifying:
25 + b^2 = 169
b^2 = 144
b = 12
So the length of the third side is 12 feet. To find the total length of fencing needed, we add up the lengths of all three sides:
5 + 12 + 13 = 30
Therefore, Shar needs 30 feet of fencing for the entire animal pen. So the answer is 30 feet.