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?

- maths-surface 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.

- maths-surface area -
**anoynomous**, Monday, March 18, 2013 at 3:51pm
what about 33dm circumfernce

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

- maths-surface 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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