Posted by anoynomous on .
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,
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,
what about 33dm circumfernce

mathssurface area(STEVE SIR) 
anoynomous,
what about 33dm circumfernce

mathssurface area 
Steve,
well, you know that C = 2pi r, so,
r = 33/2pi
Forgot about that?