# Homework Help: Cone Volume

1. Jan 11, 2010

### golb0016

1. The problem statement, all variables and given/known data
Find the volume, see attachment

2. Relevant equations
I can't find the proper equation for this cone.

3. The attempt at a solution
he triangle is a 3, 4, 5 triangle. Is the typical cone equation of 1/3*PI*r^2*h used or a different equation?

#### Attached Files:

• ###### cone.gif
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2. Jan 11, 2010

### CFDFEAGURU

Look at the units your equation would produce. If you used your equation you would get a unit that is squared implying a surface area such as meters squared (m^2). For a volume you need a unit that is cubed. So your equation is incorrect.

Think of what you need to get the correct unit of volume.

Thanks
Matt

3. Jan 11, 2010

### golb0016

The units would be m^3 (r*r*h)

4. Jan 11, 2010

### CFDFEAGURU

You got it.

Now substitute the (r*r)*h into your equation from post 1 and you should get the correct answer.

Sorry, I didn't catch the h in your first post. Looks you had it right all along.

Thanks
Matt

5. Jan 11, 2010

### golb0016

So the regular cone equation can be used even though the cone is abnormal?

6. Jan 11, 2010

### CFDFEAGURU

Yes it can be.

Thanks
Matt