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# C4 Trig question watch

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1. Hi
(http://www.mei.org.uk/files/papers/J..._2013_June.pdf)
I'm doing this paper (^). I'm on question 7 ii. I have found dy/dx, yet i cant seem to find the angle theta correctly. I believe i have taken one correct step by calculating the gradient at C, which is 99/50 or 1.99.

On the mark scheme, i cant figure out why tan(90 - theta) is used. Im under the impression that AC is 10.1(calculated in part 1), and 99/50 or 1.98 is the hypotenuse. However, using this info and the corresponding SOHCAHTOA does not give the correct answer??

Any help on what im doing wrong???
Thanks
2. hi no need for replies. Ive solved it correctly

*BUMPED*
3. (Original post by starwarsjedi123)
hi no need for replies. Ive solved it correctly

*BUMPED*

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