first, you divide the triangle in two, tΓ΄ 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 = β512
x = β2^9
x = 16β2 cm
i hope i you.
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