Mechanics Geometry

Question:
http://i148.photobucket.com/albums/s...csGeometry.jpg


Answer:
http://i148.photobucket.com/albums/s...sGeometryA.jpg


My Problem:
I don't understand what they have done in the mark scheme where I have put a red box around the part that I don't understand. Please help. Thanks in advance.

They are using a standard result, The center of mass of a uniform solid right circular cone is distance from the base (where h is the height of it.)

Bobak

I attached the formula you will be given in your M3 exam if your interested in it.

Bobak

...And what did they do to get ? What rule is it that says external angle equals that of the internal?

http://i148.photobucket.com/albums/s...ryExtended.jpg

Quote:

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Originally Posted by Air

...And what did they do to get ? What rule is it that says external angle equals that of the internal?

http://i148.photobucket.com/albums/s...ryExtended.jpg

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the tangent is just a given, they didn't work it out they defined it to make working out the height a bit more interesting.

Bobak