So the question is this 137 or is it 132. And so what I'm going to do because I'm going to place whatever this little center is along right at the vertex and I'm going to make sure that one of these bases right here is along this bottom side.Īnd then I'm going to say "well where does this other ray cross the edge of my protractor?" And I see that, that distance, if here is 90 so we're going up so we have 120 right here and I have a 135 right here. So I'm going to grab my protractor and again mine is going to look a little different it is designed for use on white boards. So when I use my protractor to measure this, because I know this is obtuse, I'm going to take the larger number. One is going to be larger than 90, one is going to be smaller than 90. It's more than 90 degrees so when you're going to use these measures there's always going to be two numbers. Before you even measure an angle kind of eye ball it and make a guess and if you look at this angle right here it's pretty clear that this is going to be obtuse. Now the last key thing that you need to take in mind is obtuse, acute or a right. And extend it all the way until you can actually give yourself a very accurate reading of the degree measure. What you need to do then, is to grab your straight edge so I'm going to grab mine and you're just going to extend that ray. Now one key thing that students kind of forget is let's say you're measuring an angle, that only goes there, same as I'm going to guess but I'm not really quite sure what the angle measure is. So you're going to have one of your sides and the vertex all lined up.Īnd then you're going to have some sort of ray that's going to extend all the way so that you can get a measure. So that is where the vertex is going to go and then along one of these two bases, so either the distance between this center and the edge over here or this center and the edge over here, that is where one of the sides of your angle is going to go. And vertex is spelled with an e and not an a. And that's where you want to put your vertex of your angle. Now every protractor is a little bit different but they're all going to have something at the middle of the base. To do that you use a protractor, the key thing about thing about using a protractor is using this alignment. In Geometry it's important to know how to measure an angle.
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