Answer:
[tex]\huge \boxed{ \mathrm{D.} \ \ a^2 +b^2 =c^2}}[/tex]
Step-by-step explanation:
The correct equation for the Pythagorean theorem is:
[tex]\Rightarrow \ \ a^2 +b^2 =c^2[/tex]
c is the length of the hypotenuse of the right triangle
a and b are the side lengths of the right triangle