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# Centre of mass

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1. I got 90-(the answer in the book) for the angle.. can anyone help explain why?
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2. I think they are after the fact that the shape is symmetric about the horizontal line through the middle of the shape parallel to the bottom edge.
3. (Original post by nerak99)
I think they are after the fact that the shape is symmetric about the horizontal line through the middle of the shape parallel to the bottom edge.

I don't see how that would change the angle compared to what I've done?
4. (Original post by pippabethan)
I got 90-(the answer in the book) for the angle.. can anyone help explain why?
The tangent function is opposite/adjacent. You seem to have accidentally done adjacent/opposite.

The length opposite is and the length adjacent is so:

.
5. (Original post by Zacken)
The tangent function is opposite/adjacent. You seem to have accidentally done adjacent/opposite.

The length opposite is and the length adjacent is so:

.
Ooops, thank you
6. (Original post by pippabethan)
Ooops, thank you
You're welcome.

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