Answer:
12.4
Step-by-step explanation:
We need to use Pythagoras Theorem.
It says the sum of the legs squared is equal to the square of the Hypotenuse
[tex] {h}^{2} = {3}^{2} + {12}^{2} [/tex]
Simplify the exponents
[tex] {h}^{2} = 9 + 144[/tex]
Add on the right
[tex] {h}^{2} = 153[/tex]
Take square root
[tex]h = \sqrt{153} [/tex]
[tex]h = 12.4[/tex]
