Math Help - Mechanics Geometry

Question:



Answer:



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?

Originally Posted by Air

...And what did they do to get ? 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