![]() ![]() This tells us that each one of the smaller hash marks corresponds to an angular change of one degree. So then, what exactly is this angular reading? Well, if we look and count carefully, if we start at 70 degrees, we can see there are one, two, three, four, five, six, seven, eight, and then nine small hash marks in between the two large hash marks corresponding to 70 and then 80 degrees. But rather, we’ll look at the top scale, where we’re about at 80 degrees. Which tells us, when we read off the angular measure of this first arm, we won’t look at the bottom scale, the one where we’re around 100 degrees. If we start from there and we go up to the first ray, or first arm of our angle that we encounter, we can see we go from 10 degrees, 20, 30, 40, 50, 60, 70, and around to 80 degrees. Since we’re reading this angle going from left to right, that means we’ll start at the far left side of our protractor at the angle zero. But since we’ve not done that in this case, since this angle is not rotated so one arm lies along zero degrees, that means we’ll need to read out the read directions of both of these arms and find the difference between them. Just as a quick side note, if we had aligned this angle so that one of the arms was laying along the zero degree marker, then we would only need to read out the position of the other arm relative to that. ![]() But just to pick one of them, let’s choose the bottom option, where our arrow moves from the left side to the right side. Considering these two options for a solution, we can pick either one. Whichever way we do it, we know that the angle □ will have a positive value to it. That means we could also measure the angle □ going right to left, like this. And in both cases, we could have zero as our starting point. That’s so we could read an angle going left to right this way or right to left this way. Now, taking a quick look at our protractor, we see that both ends have markings of zero as well as 180 degrees. The measurement of this angle, the value of □, will be the angular displacement from one arm to the other. Looking at the diagram, we see the angle □, which is defined by these two arms or rays coming out from the midpoint of our protractor. The diagram shows a protractor being used to measure the angle □.
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