standard_description: Recognize angle measure as additive. When an angle is decomposed into non-overlapping parts, the angle measure of the whole is the sum of the angle measures of the parts. Solve addition and subtraction problems to find unknown angles on a diagram in real world and mathematical problems, e.g., by using an equation with a symbol for the unknown angle measure.
problem_activity: Problem 1
Below are three angles,
$$\angle A$$
,
$$\angle B$$
and
$$\angle C$$
.
[IMG]
Which angle has the greatest measure? How do you know?
Problem 2
Estimate the measure of each angle in Anchor Task 1.
Using a 180° protractor, find the exact measure of each angle in Anchor Task 1.
Problem 3
Use a 180° protractor to find the measure of each angle in degrees.
| 1.            |https://d21royfkw9g4l6.cloudfront.net/Qz0c1pghJblJxPPnWMKvDA_8OLHZR.png|  |https://d21royfkw9g4l6.cloudfront.net/Qz0c1pghJblJxPPnWMKvDA_8OLHZR.png| image:: https://d21royfkw9g4l6.cloudfront.net/Qz0c1pghJblJxPPnWMKvDA_8OLHZR.png | 1.            |https://d21royfkw9g4l6.cloudfront.net/RokQx2LZhsF2CTQWAJkzyW_JH4LC6.png|  |https://d21royfkw9g4l6.cloudfront.net/RokQx2LZhsF2CTQWAJkzyW_JH4LC6.png| image:: https://d21royfkw9g4l6.cloudfront.net/RokQx2LZhsF2CTQWAJkzyW_JH4LC6.png |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 1.            |https://d21royfkw9g4l6.cloudfront.net/NLbOmHYZToXkxj9ilDgQH6_DXQEEI.png|  |https://d21royfkw9g4l6.cloudfront.net/NLbOmHYZToXkxj9ilDgQH6_DXQEEI.png| image:: https://d21royfkw9g4l6.cloudfront.net/NLbOmHYZToXkxj9ilDgQH6_DXQEEI.png | 1.            |https://d21royfkw9g4l6.cloudfront.net/hJ5Lr0W5n0ZLLZ0IDJqfdN_5ZB0NT.png|  |https://d21royfkw9g4l6.cloudfront.net/hJ5Lr0W5n0ZLLZ0IDJqfdN_5ZB0NT.png| image:: https://d21royfkw9g4l6.cloudfront.net/hJ5Lr0W5n0ZLLZ0IDJqfdN_5ZB0NT.png |
Use a 180° protractor to measure the labeled angles in each figure.
[IMG]


aligns: no