What is the length? I don’t really understand

Length is the term used for identifying the size of an object or distance from one point to Length is a measure of how long an object is or the distance between two points.

                           If it don't help I am sorry :(

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.

ljn

step-by-step explanation: