Given the equation:

The Pythagorean Equation represents that the sum of the square of the legs of a right triangle is equal to the square of its hypotenuse.

Where,
a = Adjacent Side (1st Leg)
b = Opposite Side (2nd Leg)
c = Hypotenuse
From the given equation, it is shown that a triangle's Adjacent Side and Hypotenuse is given. Adjacent side at 10 and Hypotenuse at 26.
Therefore, the figure that best fits the equation is the 2nd Triangle, the one at the right side.