Pythagoras Theorem:
[tex]\boxed {\boxed{a^2 + b^2 = c^2}}[/tex]
Apply Pythagoras Theorem:
[tex]4^2 + 5^2 = c^2[/tex]
[tex]c^2 = 16 + 25[/tex]
[tex]c^2 = 41[/tex]
[tex]c = \sqrt{41} [/tex]
[tex]\boxed {\boxed {\text {Answer: hypotenuse = }\sqrt{41} }}[/tex]
