Tests for parallel lines
Answers are for parents and teachers.
1
Same-side interior angles are 3x and 2x + 30°, lines parallel. Find x.
30
2
Corresponding angles are 84° and 84°. The sum of the same-side interior angles equals (degrees)?
180
3
Alternate interior angles are 41° and 49°. Are the lines parallel?
No
4
State the alternate-angle test in your own words.
If the alternate interior angles are equal, the lines are parallel.
5
Draw a line crossing two notebook lines and measure the alternate interior angles with a protractor.
Notebook lines are parallel; when measured, the alternate interior angles come out equal (this is proved in a later lesson).