Posted by anoynomous on Monday, March 18, 2013 at 2:53pm.
A cone 7dm high and 6 dm in diameter is placed on the ground. Sand is poured over it until conical heap 21 dm high and 33 dm circumference at the bottom is formed. Find how many m^3 of sand is there?

mathssurface area  Steve, Monday, March 18, 2013 at 3:45pm
volume of cone is 1/3 pi r^2 h
subtract the small cone from the large cone
That's how much is sand.

mathssurface area  anoynomous, Monday, March 18, 2013 at 3:51pm
what about 33dm circumfernce

mathssurface area(STEVE SIR)  anoynomous, Monday, March 18, 2013 at 4:13pm
what about 33dm circumfernce

mathssurface area  Steve, Monday, March 18, 2013 at 4:42pm
well, you know that C = 2pi r, so,
r = 33/2pi
Forgot about that?
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