# Math Help - Mechanics Geometry

1. ## Mechanics Geometry

Question:

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.

2. They are using a standard result, The center of mass of a uniform solid right circular cone is distance $\frac{h}{4}$ from the base (where h is the height of it.)

Bobak

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

Bobak

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

5. Originally Posted by Air
...And what did they do to get $\tan \theta$? What rule is it that says external angle equals that of the internal?

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