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Cogito

Geometry · Chapter 1 · Lesson 2

Practice Worksheet

Angle Pairs and Parallel Lines

A transversal makes eight angles and only two sizes.

11 problems · about 23 minutes · G-CO.C.9

NameDate

Figure — use these to answer the problems

Change the angle and read its measure off the protractor.
030609012015018055°
The angle55
Figure 1

Warm Up

Straightforward practice. Get the method working first.

4 problems

  1. Co-interior with 125°, lines parallel. What is it?

    Answer

  2. Vertical to 88°. What is it?

    Answer

  3. Supplement of 88°?

    Answer

  4. Alternate interior to 37°, lines parallel. What is it?

    Answer

Build It Up

The same ideas with more to keep track of.

3 problems

  1. Co-interior with 110°, lines parallel. What is it?

    Answer

  2. How many different angle sizes appear at a transversal across parallel lines?

    Answer

  3. Sort each pair by its relationship when the lines are parallel.

    Write each item under the heading it belongs to: Corresponding angles · Alternate interior angles · Co-interior angles · Vertical angles

    Equal

    Add to 180°

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

4 problems

  1. Two angles on a straight line, one 3 times the other. What is the smaller?

    Answer

  2. Vertical angles are always equal. 1 for yes, 0 for no.

    Answer

  3. The Supplement

    One angle is 65°. What is the angle beside it on a straight line?

    Answer

  4. Corresponding

    Corresponding angles with parallel lines. One is 42°. What is the other?

    Answer