Question

How do you determine area of a circle

Answer 1

Explanation:

it's radius squared timesed by pi (π)

r^2×π

if u don't have a radius but a diameter then half the diameter to get the radius

Answer 2

There are two common formulas that can be used to calculate the area of a circle. Here they are:

1. Diameter based formula:
`(\pi d^(2) )/(4)`.

Where
`\pi` is the universal value for all circles that expresses the ratio between the length of circumference and the diameter of any circle. It's a rational number and its value is about 3.141592653589793238462643383279502884197..., so you may want to just 3.14.

2. Radius based formula:
`\pi r^(2)`.

This is the easiest and simplest formula. Letter "r" represents the length of radius of the circle,

3. Circumference based formula:
`(C^(2) )/(4\pi )`.

Rarely used formula. In this equation, "C" represents the length of circumference of the circle.

Check the attached image to better understand the meaning of radius, diameter and circumference. Also, provided a second image with all the formulas for the area of a circle.