The truncated

The truncated rotating cone has bases with radii r1 = 8 cm, r2 = 4 cm and height v = 5 cm. What is the volume of the cone from which the truncated cone originated?

Correct answer:

V =  670.2064 cm3

Step-by-step explanation:

r1=8 cm r2=4 cm v=5 cm  r2:x=r1:(x+v)    r2 (x+v)=r1 x 4 (x+5)=8 x  4x=20  x=5   h=v+x=5+5=10 cm  V=13 π r12 h=13 3.1416 82 10=670.2064 cm3

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