It would be the radious squared times pi
R2xpi (3.14)
* * * * *
The text is wrong, the formula is correct.
The circumfernce is 2*π*radius or, since the diameter is double the radius, circumference = π*d
π is an irrational number which is approximately 3.14
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The formula; 2 * Pi * Radius = circumference Will calculate the circumference of a circle.
find the radius of a circle with circumference of 42.1
The circumference of a circle is the length of the circle's perimeter.
circumference of a circle = 2piradiuis or diameter*pi
When the shape is a circle, then the perimeter is called"circumference".The circumference IS the perimeter of a circle.