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Video: Determining the Measure of an Angle Using the Protractor

Tim Burnham

What is 𝑚∠𝐵𝐴𝐶?

01:01

Video Transcript

What is the measure of angle 𝐵𝐴𝐶? Well 𝐵 is here, 𝐴 is here, and 𝐶 is here. And this means in order to measure angle 𝐵𝐴𝐶, we’re looking for the size of this angle here.

Now luckily the whole question has been presented on top of a protractor and better than that it’s even been properly lined up. We’ve got 𝐴 at the main point here and then we’ve got the line 𝐴𝐵 mapped along the baseline of our protractor. So all we have to do is start counting at zero and follow up this scale here to see what angle is measured.

And it goes wonderful notch further than ten. Each of these little notches on a scale represent one degree. So that’s ten plus one is eleven degrees. And that’s our answer: the measure of angle 𝐵𝐴𝐶 is eleven degrees.