For example pi(r)^2 For the area of a circle and 2(pi)r for the circumference of a circle.
I remember these formulas, but never conceptually grasped why we use a seemingly random number (22/7) and use it in various different formulas for various calculations.
someone ELI5 please.
In: Mathematics
The number is simply a ratio of a circle’s circumference to its radius, you’re just taking one number divided by another. If you drew a perfect circle and measured these two, you’d get pretty close to Pi. Mathematicians don’t draw circles, but use formulas. Here’s an example:
π = (4/1) – (4/3) + (4/5) – (4/7) + (4/9) – (4/11) + (4/13) – (4/15) …
The more terms you add (following this sequence), the closer you get to Pi.
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