what is A=3.14r^2

4 Answers

gsenviro's profile pic

gsenviro | College Teacher | (Level 1) Educator Emeritus

Posted on

This is an equation of the area of a circle with a radius of 'r'.

3.14 represents the value of 'pi'. 

Conventionally, area of a circle is given as:

`A = pir^2 = pi/4 d^2`

Where A is area, r is radius, and d is diameter of the circle. The diameter is exactly twice the radius of the circle, i.e. d = 2r.

Hope this helps.

shelly1689's profile pic

shelly1689 | High School Teacher | (Level 1) Adjunct Educator

Posted on

This is the formula for the area of a circle where,

A is area

3.14 is `pi`

r is the radius of the circle.

anncampbellga's profile pic

anncampbellga | (Level 1) Adjunct Educator

Posted on

This is the formula that is used to find the area of a circle.  It means area (that's the capital A) equals pi (which has been abbreviated to 3.14) multiplied by the square of the radius (remember the radius if the distance from the center of the circle to any point on the circle - or half of the diameter).  You have to follow the order or operations (PEMDAS) - so make sure you square the radius first (multiply it by itself) and then multiply by 3.14.

Educator Approved

Educator Approved
goodthink's profile pic

goodthink | Student, Grade 12 | (Level 1) Honors

Posted on

What you have asked is the formula of the circle, which is A=`pi * r^(2)` 

`pi` is a Greek letter that is irrational, meaning it goes on forever. Because of this, it is commonly rounded off at 3.14.

Another way to represent this is using the fraction `22/7 `  because it also is approximately 3.14.