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 = 100 ⋅  pi S = 90 ⋅  pi  s = r2+v2​  V = π r2 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
v1​=300/r12​=300/52=12
r2​=2⋅ 5​=2 5​=4.4721
v2​=300/r22​=300/4.47212=15

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