[4X4]

Sorry to start a new thread for a simple question, but it has to be done. I used to get very good grades in math, but apparently all that pot I smoked in high school erased my ability to calculate the volume of a cylinder.

I need to order concrete to fill some pilings at a site. I have 6 pilings that are 5 feet deep and 16 inches in diameter.

I know that the formula for volume is pi r squared h. I have imperial measurements, but need to order the crete in metric.

I first calculated that I needed 11 meters, but refused to believe it, then I calculated that I needed 4.7 meters, but that seemed too much as well. Turned out that I was using diameter instead of radius. I now have it calculated to be just under 2 meters.

WTF happened to me? This is embarrassing asking for help on this, but it'll be doubly embarrassing if I order way too much or way too little.

So, fine folks of cp, how much crete do I need in cubic meters?

After I have a consensus on the volume, we can let this thread degenerate into a 4x4 mockfest. Or we can discuss how funny it is that something so simple can be forgotten so easily.