Angles are formed by intersecting lines or rays. If you take any two lines or rays, will you form at least one angle?
Angles and Lines
Explain why you must use three letters to identify any of the angles in the diagram below.
Let's look at an example problem.
Earlier, you were asked if will you form at least one angle if you take any two lines or rays.
As long as the lines or rays intersect, at least one angle will be formed. If the lines (or rays) are parallel, and therefore don't intersect, then no angles will be formed.
Name the angle below and classify it by its size.
Estimate the measure of the angle from #1. Use a protractor to confirm your answer.
What are two lines that form a right angle called?
1. What's the difference between a line segment, a line, and a ray?
2. Draw an example of a right angle.
3. Draw an example of an obtuse angle.
4. Draw an example of an acute angle.
5. Why are two angles that make a straight angle always supplementary?
Use the diagram below for #8-#12.
8. Give an example of vertical angles.
9. Give an example of a straight angle.
10. Give an example of supplementary angles.
13. What do you remember about perpendicular lines?
Use the angle below for #14-#15.
14. Name the angle and classify it based on its size.
15. Estimate the measure of the angle. Use a protractor to confirm your answer.
To see the Review answers, open this PDF file and look for section 1.2.