SOLUTION: A lamp shade is in the form of a frudtum of a cone.the button radius is thrice the top radius and the height is 14cm,if the volume of a lamp shade is 763cm3.calculate the buttom ra

Question 1127568: A lamp shade is in the form of a frudtum of a cone.the button radius is thrice the top radius and the height is 14cm,if the volume of a lamp shade is 763cm3.calculate the buttom radius

Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A lamp shade is in the form of a frustrum of a cone.
The bottom radius is thrice the top radius and the height is 14cm,
If the volume of a lamp shade is 763 cm3., calculate the bottom radius
:
The volume formula of a frustrum:
In this problem we have
= 763
the top radius = r
the
3r = the bottom radius (R)
= 763
:
= 763
:

:
r^2 ~ 4
r = 2 cm is the top radius
then
3(2) = 6 cm is the bottom radius, a very tiny lamp
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