Comparing Pythagorean Theorem and the Equation of a Circle

The Pythagorean theorem is a^2+b^2=c^2 and the equation of a circle is (x-h)^2 + -k)^2 = r^2
These two equations are similar because since both equations use the same specific values plugged in. They also are similar because they are both true with any right triangle and any circle and both use the shapes' grid points to calculate the distance.