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    • Thread Starter

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    Posted on the TSR App. Download from Apple or Google Play

    The answer and how you worked it out is correct, but the way you have written your working out is wrong:

    You cannot write 5 - 2 = 3 x 180 = 540 - it simply isn't true - you are saying that 5 - 2 = 540

    You have 2 ways of writing it:
    (5 - 2) x 180 = 3 x 180 = 540
    5 - 2 = 3
    3 x 180 = 540

    I am fairly sure that for this question it wouldn't matter, as I believe (not sure as I don't have the mark scheme) that the marks are all for the answer, but it is better to get into good habits
    • Thread Starter

    why is it only 2 marks if you're doing 3 steps ?
    Posted on the TSR App. Download from Apple or Google Play

    I would guess that it is a mark for calculating interior angle, then a mark for calculating exterior angle.
    Since you can calculate the interior angle as (n-2)*180/n (n is number of sides) you could calculate interior angle in 1 step.
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