# 030 Review Problem - Amount of molten glass in a lump

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## Comments

## considering the volume of

considering the volume of triangular prisms, when the hollow cylinder is stretch in horizontal layer, after cutting longituninally, will make the solution incorrect. The cross-section of the base, B will become trapezoidal not rectangular

## The hollow cylinder is

The hollow cylinder is actually very thin in comparison to its diameter. The error you mentioned is actually too small to include in calculation.

## Hi! Rommel I got the idea..

Hi! Rommel I got the idea...see my other comment.....since this is solid geometry, guided by formula and justified by figure, whether the unit is too small if accuracy is needed, you cannot deny the correct solution.. what if we use km as the unit...anyway...I had answered the whole book in solid mensuration when I was in the college of civil engineering, the knowledge of solid geometry help be to become efficient estimator...HAVE A NICE DAY

## Thanks Isagani for your

Thanks Isagani for your feedback. Maybe I will also show the solution you suggest if I've got the time to do it. Not by this time though.

## the circumference of inner

the circumference of inner diameter is not similar to the circumference of outside diameter, for this reason, it cannot be considered as rectangular prism and the base to be considered is trapezoidal...

## ok, I got the idea.....you

ok, I got the idea.....you consider the diameter, as the average or middle diameter of the hollow cylinder....since it falls on the middle, the answer could be correct

## The problem did not specify

The problem did not specify if the diameter is inner or outer. The solution above took the given diameter as the nominal diameter. How is the result of your calculations compared to the value of the result above? I suspect it is very small but I might be wrong because of the length. I did not verify it yet.

## I will send you my solution

I will send you my solution now if you will give me your e-mail..I am free now

## You can actually post it here

You can actually post it here as a comment. You can take a picture of your work and upload it in the comment.