What's Special?

Since you've spent a little time talking about transversals in general, now we get to talk about the cool stuff that happens when a transversal crosses two lines that are parallel to each other. In the activity below, you can move the sliders to change the diagram and see how the angle pairs that we talked about earlier behave. Note:

The top slider changes the slope of the transversal. (The way it is tilted.)
The bottom slider changes the slope of the parallel lines.
Check the box next to the angle pair that you would like to see.
When the angles are the same color, that means they have the same measure.

In the diagram, select "Show Corresponding Angles." Which is/are true about what happens as you move the sliders?

Select all that apply

A
The angles stay the same as each other (same color/size).
B
The top angle becomes larger as the bottom angle becomes smaller.
C
The angles change at different rates.

Check my answer (3)

In the diagram, select "Show Alternate Interior Angles." Which is/are true about what happens as you move the sliders?

Select all that apply

A
The angles stay the same as each other (same color/size).
B
The top angle becomes larger as the bottom angle becomes smaller.
C
The angles change at different rates.

Check my answer (3)

In the diagram, select "Show Alternate Exterior Angles." Which is/are true about what happens as you move the sliders?

Select all that apply

A
The angles stay the same as each other (same color/size).
B
The top angle becomes larger as the bottom angle becomes smaller.
C
The angles change at different rates.

Check my answer (3)

In the diagram, select "Show Same-Side Interior Angles." (This is the same as Consecutive Interior Angles.) Which is/are true about what happens as you move the sliders?

Select all that apply

A
The angles stay the same as each other (same color/size).
B
The top angle becomes larger as the bottom angle becomes smaller.
C
The angles change at different rates.

Check my answer (3)

Alternate Interior

Move points A, E, or D in the diagram above. 1. What do you notice about the angle measures? 2. What generalization can we make about alternate interior angles when parallel lines are cut by a transversal?

Check my answer

Alternate Exterior

Move points A, E, or D in the diagram above. 1. What do you notice about the angle measures? 2. What generalization can we make about alternate exterior angles when parallel lines are cut by a transversal?

Check my answer

What's Special?

Alternate Interior

Alternate Exterior

Consecutive Exterior Angles

Consecutive Interior Angles

Corresponding Interior Angles

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