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MC-2A Help on 9.27

 
 
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MC-2A Help on 9.27
by Eddy zheng - Sunday, 11 November 2018, 9:46 AM
 

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
by Eddy zheng - Sunday, 11 November 2018, 2:59 PM
 

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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Picture of David Reynoso
Re: MC-2A Help on 9.27
by David Reynoso - Monday, 12 November 2018, 1:59 PM
 

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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