Associated Topics || Dr. Math Home || Search Dr. Math

```
Date: 9/8/96 at 22:29:58
From: Bob Vanselow

Which side of a protractor scale do you use?
```

```
Date: 9/9/96 at 11:39:23
From: Doctor Robert

I think that the easiest way to decide which scale to use is to look
at the angle you're measuring.  If it is greater than a right
angle (more than ninety degrees) then use the scale that has numbers
greater than 90. If the angle is obviously acute (measures less than
90 degrees), use the scale which has numbers less than 90.

Of course you have to line up the protracter correctly with the center
point on the vertex of the angle and one of the rays of the angle
coincident with the line on the protracter.

Happy measuring!

-Doctor Robert,  The Math Forum
Check out our web site!  http://mathforum.org/dr.math/

```
Associated Topics:
Middle School Geometry
Middle School Measurement
Middle School Two-Dimensional Geometry

Search the Dr. Math Library:

 Find items containing (put spaces between keywords):   Click only once for faster results: [ Choose "whole words" when searching for a word like age.] all keywords, in any order at least one, that exact phrase parts of words whole words

Submit your own question to Dr. Math
Math Forum Home || Math Library || Quick Reference || Math Forum Search