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G.CO.9 Exploring Corresponding Angles

Author:Cindy Almazan, Tim Brzezinski
In the applet below, a TRANSVERSAL intersects 2 PARALLEL LINES. When this happens, there are 4 pairs of corresponding angles that are formed. Interact with the applet below for a few minutes, then answer the questions that immediately follow.

Move the slider (Slide Me!), what transformation took place? Explain how you know.

If the pink angle (1st pair) above measures 52 degrees, what would the measure of its corresponding angle be? Use transformations to justify your reasoning.

What would the measure of the grey angle (2nd pair) be? Explain how you figured it out.

How are the 1st pair and 3rd pair of angles (both pink) related? Use transformations to explain the relationship.

In your own words, describe corresponding angles and what holds true about their angle measure.

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