Answer:
13
Step-by-step explanation:
when you sketch the question you find that the figure formed is a triangle
X
|\
| \
| \ ?
12m |. \
|_____\
Z. 5m Y
using Pythagorean theorem:
b^2 + h^2 = H^2
hence
5^2 + 12^2 = H^2
you square all the digits to get
25 +144 = H^2.
add 144 to 25 to get
144+25=169
hence
H^2 = 169
square root both sides
√H^2 = √169
hence H=13
