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Can someone please tell me how to determine the reference angle. I can sketch these but no idea what a reference angle is. The learning video skipped past this. Thanks

4 Answers

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It’s just the angle measure from/to the x-axis in whatever quadrant you’re in.

Given 350 degrees the reference is 10
Given 280 degrees the reference is 80

I think the point is… if you only had a horizontal line, and you wanted to measure an angle you could choose to measure the angle or the reference angle. This will ensure that every angle is <90degrees and therefore can be measured using one tool.
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In Q1 θref=θ

In Q2 θref=180-θ

In Q3 θref=θ-180

In Q4 θref=360-θ
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The two arrows are at 90 degree to each other and in the first quadrant.
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You can use 90 degree as reference angle and then make guesses

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