1. Find the missing angle!

2. Our job is to find the missing measure of angles and it is really easy to do!

3. What do you need to know?

4. An acute angle is 89˚or less. An obtuse angle is 179˚ or less. A right angle is 90˚ A straight angle is 180 ˚.

5. Angles on a straight line add up to…

6. Yep! 180˚

7. One more thing… How many of you remember how to add and subtract?

8. You’d better know! Well, all you need to do is add or subtract to find a missing angle!

9. Let’s look!

10. http://www.math- aids.com/cgi/angles_suppleme ntary.pl?dec=0&probs=8&langu age=0&memo=&answer=1&x=11 5&y=20

11. How does this work, you ask? Well, remember….a straight angle is 180˚, so look at the measure of the angle that is shown and subtract it from 180˚!

12. Now let’s practice! http://www.math- aids.com/cgi/angles_supplementary.pl?dec=0&pr obs=8&language=0&memo=&answer=1&x=115&y= 20 http://www.math- aids.com/cgi/angles_supplementary.pl?dec=0&pr obs=8&language=0&memo=&answer=1&x=115&y= 20