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    I'm so stuck on q4c Name:  image-3c484056-1579-4309-ba46-31e33661a7ce637305151-compressed.jpg.jpeg
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    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) = 0.5\times r^{2}\times \theta
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    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.
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    Is this GCSE or AS level?
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    (Original post by Y11_Maths)
    Is this GCSE or AS level?
    AS or A-level
    Since angles are measured in radians instead of degrees.
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    thank you so much
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    somehow I'm still getting it wrong, what's wrong with my working?Name:  image-19299e79-0887-4217-b2ed-4891200506ff26552505-compressed.jpg.jpeg
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    Looks like a rounding error on angle B.
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    (Original post by old_engineer)
    Looks like a rounding error on angle B.
    Thank you so much!😀
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