Uses of π
π on the elementary level is no more than a means of finding area and circumference. In geometry and elementary math, we are taught that π is used to find area by multiplying the radius squared times π. Thus comes the formula:
Take the following problem:
You have a circle whose radius is equal to 3 cm. What is the area?
To solve this problem, you would take what you know (r=3) and plug it into your formula. So you have:
You get A=9π or approximately 28.27.
π is also used on the elementary level to find the circumference of a circle, or the perimeter of a circle. We know the following formulas:
These problems are calculated very similarly to the problem above. Find the circumference of the circle above.
This is completed very simply. You again take what you know (r=3) and plug it into your formula. So you now have
or C=6π. This is approximately 18.85.