Answer:
4cm
Step-by-step explanation: Remember that the Pythagorean theorem is[tex]c^2 = a^2 +b^2[/tex]
c will be the hypotenuse which is 5cm
a will be the horizontal side which is 3cm
Time to set it up: [tex]5^2=3^2+b^2[/tex]
[tex]25=9+b^2[/tex]
From here we'll just solve for b and then square root for the answer.
[tex]25-9=b^2\\
[/tex]
[tex]16=b^2\\
4=b\\
[/tex]
