McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
6. Similarity Transformations
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Exercise 33 Page 599

By the Converse Triangle Proportionality Theorem, if a line intersects two sides of a triangle and separates the sides into proportional corresponding segments, then the line is parallel to the third side of the triangle.

Are the Segments Parallel? Yes.
Explanantion: See solution.

Practice makes perfect

We are given a triangle △ABE and we want to determine whether the segments AB and CD are parallel.

By the Converse Triangle Proportionality Theorem, if a line intersects two sides of a triangle and separates the sides into proportional corresponding segments, then the line is parallel to the third side of the triangle. Let's substitute in the lengths provided and see if the sides are divided proportionally. AC/CE ? = BD/DE ⇔ 8.4/6 ? = 6.3/4.5 We will simplify each ratio as much as possible to see if they are equivalent.
8.4/6 ? = 6.3/4.5
1.4 = 1.4 ✓
As we can see, the sides are divided proportionally. Therefore, the segments AB and CD are parallel.