The Pythagorean theorem states:
[tex]c^2=a^2+b^2[/tex]
where a and b are the legs and c is the hypotenuse of the right triangle.
Substituting with a = 4 and b = 2, and solving for c,
[tex]\begin{gathered} c^2=4^2+2^2 \\ c^2=16^{}+4 \\ c^2=20 \\ c=\sqrt[]{20} \\ c=4.5 \end{gathered}[/tex]
