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## 4th grade

### Course: 4th grade > Unit 12

Lesson 2: Measuring angles# Measuring angles review

CCSS.Math:

Review measuring angles with a protractor, then try some practice problems.

## Measuring angles

Angles are measured in degrees. We can use a protractor to measure how many degrees an angle is.

**Example:**

Measure the following angle in degrees:

First, we line up the dot on the center of the protractor with the vertex of the angle.

Next, we rotate the protractor so that the 0, degrees mark lines up with one side of the angle.

Finally, we read the protractor to see where the other side lines up.

**The angle is 70, degrees.**

*Want to learn more about measuring angles? Check out this video.*

## Want to join the conversation?

- how can we move the triangle so we get in the right space so we can get it right?(38 votes)
- If you click and hold on the protractor, you can drag it wherever you want. You will need to drag the protractor so that the dot in the middle of the straight side is exactly over the "vertex" of the angle (this is the point where the two lines of the angle meet).

Once you have the protractor in the right place, you can unclick. Then just click and drag the green arrow to rotate the protractor around. You will want to rotate the protractor until the part that says "0" lines up with one side of the angle.

Now you can tell what the measure of the angle is by seeing what number the other side of the angle passes through on the protractor.

Hope this helps!(61 votes)

- OMG I figured it out! lol Question, is it possible to kind of eye the measurement? Where you dont use any tools you just look at the angle?(11 votes)
- I think you can.(5 votes)

- What job we need to use this?(15 votes)
- Engineer, Programmer, most if not all of the trades, and probably a few more.(3 votes)

- sometimes it is easy to guess the angle measure so why use protractors(5 votes)
- sometimes we need to use protractors to find the exact answer of degrees.(12 votes)

- that was a lot easier after just looking at it(11 votes)
- I know but when you do it it is not easy(2 votes)

- The questions are very easy and simple. Could you do a version for older kids?(11 votes)
- why is it very hard to line up the lines(7 votes)
- I Want to try more problems like this(10 votes)
- By the way, in one of the problems, that answer was supposed to be 40 degrees, but there is another way. If you line in up the other side and rotate it, you get 140 degrees.(9 votes)
- i still don't get what you are saying(1 vote)

- I would really like more questions with protractors.(7 votes)