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# M2 June 2014 Q3 watch

1. any help with this please? I thought i got it but for a i got 10.5a and online solutions got something else (Arsey)
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2. (Original post by mattvm)

any help with this please? I thought i got it but for a i got 10.5a and online solutions got something else (Arsey)
Tell me your numbers for areas and your equation and I'll look for the error.

Your answer puts the C of M above the top of the triangle!
3. (Original post by tiny hobbit)
Tell me your numbers for areas and your equation and I'll look for the error.

Your answer puts the C of M above the top of the triangle!
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4. (Original post by mattvm)
Two things:

The C of M of a triangular lamina is 1/3 of the way up, not 1/2 way up.

You need to subtract the second part of your equation since the "white" triangle isn't there (or to look at it another way, white triangle + the actual lamina = the big triangle)

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