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MC-2A Help on 9.27

 
 
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MC-2A Help on 9.27
zhengEddy - 2018年11月11日 Sunday 09:46
 

I have no clue on how to start this after cutting the tetrahedron, and I am also confused on how to cut the tetrahedrons. 

Thanks

 
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Re: MC-2A Help on 9.27
zhengEddy - 2018年11月11日 Sunday 14:59
 

Nevermind, I figured it out. Thanks anyways. Also, I am having a little trouble understanding what to do in 9.30. Do we find the radius of the sphere? And how do I even start the question?

 
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Re: MC-2A Help on 9.27
ReynosoDavid - 2018年11月12日 Monday 13:59
 

Think of the sphere that is inscribed in the conic frustrum as a ball stuck in a cone.

You'd see that the sphere is touching the frustrum at one point on the bottom base, one point on the top base, and around a circle on the "side". Your goal is to find the radius of this circle.

A side view diagram of the frustrum might help:


 
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