The value of x using the similarity of triangles is 14.
What are similar triangles?
Two triangles are said to be similar triangles if corresponding angles are equal and corresponding sides, as well as corresponding altitudes, are in proportion.
△ A B C ∼△ F G H
[tex]\frac{21}{x} =\frac{9}{6} \\\\x = 21*6/9\\\\x = 14[/tex]
Therefore, The value of x using the similarity of triangles is 14.
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