Answer:
x = 12
Explanation:
Since the triangles are similar then the ratios of corresponding sides are equal, that is
= , substitute values
= = ( cross- multiply )
3x = 36 ( divide both sides by 3 )
12
if their similar then find the proportion with a cross multiplication equation
x/36 = 13/39
x*39 = 36*13
39x = 468
x = 468/39
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