what is the missing shape

Answer:
C is [tex]\sqrt{52}[/tex] or [tex]2\sqrt{13}[/tex]
Step-by-step explanation:
Using the Pythagorean theorem, you know that [tex]C=\sqrt{4^2+6^2}=\sqrt{16+36}=\sqrt{52}=2\sqrt{13}[/tex]. Hope this helps!