median
don steward
mathematics teaching 10 ~ 16

Wednesday 27 February 2013

cone frustum

how do you work out the volume (in general)?
[it's a cone with a smaller cone chopped off]

how do you work out the curved surface area?
[it's a part of an annulus]



what if you don't know 'h' ?
find the volume of the cup
what is the volume of this bowl?


work out the dimensions of the portion of the annulus (washer shape) needed to make the fabric of this lampshade

(ignoring any overlap of material)

show that the angle required is 207.57 (to 2dp) degrees





No comments: