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Maths mistake notebook

Mistake notebook·Maths
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Maths mistake notebook

Mistake notebook·Maths
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This is an example notebook. Sign up and every mark you drop goes into your own.

Monday 19 October

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Tuesday 6 October

A, B and C are points on a circle with centre O. Angle AOC is 130°. Work out angle ABC. Give a reason for each stage of your working.

Question

A, B and C are points on a circle with centre O. Angle AOC is 130°. Work out angle ABC. Give a reason for each stage of your working.

Your answer

Why did it go wrong?

What do these mean?
You knew how to do it and slipped: a sign, a sum, a misread.You were sure it was right, but the idea behind it was wrong.You haven't learnt this yet, so you couldn't start it.