Circl geo quick question (1 Viewer)

[jathu123]

So my friend needed some help on a circle geo question: http://imgur.com/A4Z0pSb. But the thing is I did it like last year and completely forgot most of the theorems and how to properly prove. But I looked up some in the internet and managed to do them, however I'm not sure if my answers are formal/correct wording (especially for the second part). So I would really appreciate if anyone could check it and correct any mistakes.

part 1: http://tinypic.com/view.php?pic=2hnxo41&s=9
part 2: http://tinypic.com/view.php?pic=2z9imp0&s=9
part 3: http://tinypic.com/view.php?pic=52i2df&s=9

Again thanks for any responses

 

[parad0xica]

Part 1 should be done with 1 reason because 1 mark: one pair of opposite angles are supplementary

Part 2 and 3 links don't work

 

[wu345]

I'm pretty sure your proofs are all correct, however you might be able to shorten some of them:
1. In part i) I think you only really needed the first and last steps.
2. In part ii) I don't think you need to write 'are equal', at the end of the angles subtended on the same arc theorem since your statement (APE=ADE) basically says that. Notice how you didn't write vertically opposite angles 'are equal' in part iii) but simply, (vertically opposite angles).

 

[jathu123]

oh ok thanks parad0xica
so for part 2: http://imgur.com/nOx17yq
part 3: http://imgur.com/SJcZcUC

 

[si2136]

Next time, it would be good to make the image link direct.

Yes, the working out is legitimate.