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# Maths geometry homework help watch

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2. (Original post by Zonyali123)
Looks fine. All your reasoning looks ok to me.
3. (Original post by Zonyali123)
In an exam you cannot write (for question 5) e = 117 - 38.

This is because you have completed missed out a step, even though I know you have done it in your head.

You first need to use that the third, unlabelled angle in the triangle is 180 - 117, because there are 180 degrees in a straight line, and because the angles of a triangle add up to 180, 180 - (180 - 117) - 38 = 180 - 180 + 117 - 38 = 79 = e would be the correct answer for full marks.
4. (Original post by SeanFM)
In an exam you cannot write (for question 5) e = 117 - 38.

This is because you have completed missed out a step, even though I know you have done it in your head.

You first need to use that the third, unlabelled angle in the triangle is 180 - 117, because there are 180 degrees in a straight line, and because the angles of a triangle add up to 180, 180 - (180 - 117) - 38 = 180 - 180 + 117 - 38 = 79 = e would be the correct answer for full marks.
Thank you for your help. Yes I see what you mean. Are the rest correct?
5. (Original post by Zonyali123)
Thank you for your help. Yes I see what you mean. Are the rest correct?

I sampled it just now by looking at question 9 and your answer and working there is sufficient and correct so I would assume the rest is too.
6. (Original post by B_9710)
Looks fine. All your reasoning looks ok to me.

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