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# trigonometry help watch

1. I'm so stuck on q4c
2. Find area of the triangle then subtract the area of the three sectors inside of it.

As you probably know:

Area of sector (in radians) =
3. For part 4-c you gotta find the total area of the triangle first after that you gotta find the area of the sector in each of the three circles (area of arc=0.5theta r^2). The shaded area is the sum of areas of sectors subtracted from the area of the triangle ABC.
4. Is this GCSE or AS level?
5. (Original post by Y11_Maths)
Is this GCSE or AS level?
AS or A-level
6. thank you so much
7. somehow I'm still getting it wrong, what's wrong with my working?
8. Looks like a rounding error on angle B.
9. (Original post by old_engineer)
Looks like a rounding error on angle B.
Thank you so much!😀

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Updated: February 15, 2018
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