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So this next trick isn't something you will do every day, but when you do need to measure a particular angle, sure it comes in handy. So let's say I want to know what the angle is of this intersection here. So we'll get our friend, the Ruler tool. By default you click and drag straight line segments here to measure that distance. So I'm going to line it up with the start of the angle there and then to pull that out to become a protractor, if you hold down the Option key or the Alt key, and go to where that line segment end, you will see the cursor changes to kind of an angle indicator. Click and start dragging again and you actually pull off a second segment which then measures the angle between the two lines. If you take a look at the Options bar, it tells you exactly what that angle is as well as showing you what the length of each of those segments are.
So you can pull out a protractor by Option or Alt dragging from the previous, and the line segment, and drag out a new line segment to create that angle measurement.
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