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## Homework Statement

Hi

Im having some difficulty with the following question:

Figure P1.14 shows a frustrum of a cone. Of the following mensuration (geometrical) expressions, which describes (a) the total circumference of the flat circular faces, (b) the volume, and (c) the area of the curved surface?

(i) π(r1 + r2)[h2 + (r1 – r2)2]1/2 (ii) 2π(r1 + r2) (iii) πh(r1^2 + r1r2 + r2^2)

and Im at part b.

Since I already know that the volume of a frustum of a cone is number (iii) I have to now prove it.

The problem is that Im having some difficulty showing it with the use of dimensional analysis.

Since V=[L^3]

how is possible that πh(r^12 + r1r2 + r2^2) is equal to it?

I know that r=L and h=L but completly confused on how to set it up

can someone point me in the right direction? I dont

thank you