The figures shown are similar. What is the scale factor?
Diagram contains two trapezoids. The first has a base of 10. The second has a base of 18.
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The scale factor can be found by dividing the length of the base of the second trapezoid by the length of the base of the first trapezoid.
Scale factor = length of base of second trapezoid / length of base of first trapezoid = 18 / 10 = 1.8.
Therefore, the scale factor is 1.8.