Rotating 7947

In the rotating cone = 100π
S rotating cone = 90π
v =?
r =?

Correct answer:

r1 =  5
v1 =  12
r2 =  4.4721
v2 =  15

Step-by-step explanation:

V=100π S=90π  s=r2+v2  V=πr2 v/3 S=π r s+π r2  300=r2 v 90=r r2+v2+r2  v=300/r2  90=r r2+3002/r4+r2  r1=5
r2=2 5=2 5=4.4721

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