1. Measuring Angles using Addition and Subtraction

2. Measuring Angles using addition
Adding the two angles given to find
the measurement of the
acute angle.
= 79

3. Let’s Practice!!
What do you recognize?
Add both angles = 157

4. Try this one on your own!!

5. Did you get 60! Recognize you have both angles add 24 + 36 = 60

6. Measuring angles using Known angles
Recognize that you don’t have all your angles.
Right angle which means 90 degrees.
Add = 154

7. Measuring angles using subtraction
Recognize that you have a missing angle.
<ABD is 92.
92-37 = 55
Check work by adding to get 92.
<ABD = 92

8. Let’s Practice! <CBA= 45 22 What do you recognize?
Missing an angle.
Know <CBA is 45degrees.
So subtract = 23
22
<CBA= 45

9. Try this one on your own!
<RSU = 70

10. Did you get 26! Recognize you have a missing angle. <RSU = 70
= 26

11. Measuring angles using Known angles
Recognize that you have all angles, but you should see that you
have a straight angle.
Straight angle which means 180 degrees.
Subtract 180 – 62= 118