McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
3. Similar Triangles
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Exercise 40 Page 568

How can you use the Angle-Angle (AA) Similarity Postulate to construct a triangle that is similar to △ ABC?

See solution.

Practice makes perfect

We are given triangle ABC as shown in the following diagram.

It is our goal to draw a triangle that is similar to △ ABC. To do this, we will draw a triangle such that has two pairs of congruent angles with △ ABC. Let's carefully perform the construction step by step.
  • Begin by drawing two points, X and Z, and a line that passes through them by using a ruler.
  • Place the center of a protractor on X so that the line drawn on the bottom portion of the protractor coincides with XZ. Then, locate 34^(∘) on the protractor and mark a point P. This is the measure of ∠ ZXP. Draw a line through X and P to create XP.
  • Place the center of the protractor on Z such that its line coincides with XZ. Then, mark a point Q such that the measure of ∠ XZQ is 75^(∘). Draw ZQ.
  • Let Y be the intersection point between XP and ZQ. By the Angle-Angle (AA) Similarity Postulate, △ ABC ~ △ XYZ.

We have drawn a triangle that is similar to △ ABC!