Jimmy Campbell

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3. what is the convention for positive rotation

Apologies - bad post. I just found the video that clarifies that the convention is indeed that a positive rotation is in the anticlockwise direction! https://www.khanacademy.org/math/cc-eighth-grad...

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3. Why isn't this a right angle?

You don't really need a protractor. We know that all of the sides are of the same length (10cm) so we can just use a ruler to measure the diagonals and see if it's really a square. In a square, the...