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step-by-step explanation:
i think it might be a but you might want a second opinion
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.
for exempl this system of equations y = x - 3
y = 2x - 5
look the line : y = x -3 ( red)
the line : y = 2x -5 ( bleus)