Circle Areas and Cylinder Volumes
The area of a circle uses the formula πr², where you multiply the radius by itself, then by π (roughly 3.14). This becomes your foundation for calculating cylinder volumes.
For cylinder volume, you're essentially stacking circles on top of each other. Calculate the circle's area first, then multiply by the height or length. The formula becomes π × r² × height.
When dealing with sector cylinders (like a slice of cake), multiply your answer by the angle over 360. For example, if you have a 90° sector, multiply by 90/360 or ¼.
Quick Tip: Always square the radius first, then multiply by π and height - this order prevents calculation errors!
