Hello,
one of two<span> fixed points inside an ellipse from which the </span>sum<span> of the </span>distances<span> to any point on the ellipse is constant. </span>
To find the perimeter, you add up all the sides.
11 + 5 + 13 = 29
29 inches is the perimeter.
The answer is 16 if you solve it, because the square root of 64 is 8 and 2 * 8 = 16