Pls help me, and do not send links. Thanks

i uploaded a vid on this here

https://www.you tube.com/watch?v=dQw4w9WgXcQ

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.

i dont know the answer but here's a picture of a dog