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The perimeter of a cirlcle is its circumference which is: 2*pi*radius or diameter*pi

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Q: What is the perimeter of 21 mi of a circle?
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Related questions

What is the perimeter of 21 of a circle?

The perimeter which is the circumference of a circle is: pi*diameter or 2*pi*radius


What name is given to the perimeter of circle?

The perimeter of a circle is its circumference


Is the perimeter of a circle cubed?

No because the perimeter of a circle is its circumference


What is the name for the perimeter of a circle'?

circumference


What is the name of the perimeter of a circle?

The perimeter of a circle would be the circumference.


What is the ther name for the perimeter fora circle?

The perimeter of a circle is its circumference


What is perimeter in circle?

Pi (3.1415...) times the diameter of the circle = the perimeter


What is the equation to find the perimeter of a circle?

Circumference ("perimeter") of a circle = (pi) x (diameter of the circle)


How do you find the perimeter if you already know the circumference of a circle?

The circumference of a circle is the length of the circle's perimeter.


How do you find the perimeter when circumference is given?

When the shape is a circle, then the perimeter is called"circumference".The circumference IS the perimeter of a circle.


What is perimeter of a circle called?

The length of the perimeter is the circumference. The perimeter itself is the boundary between the interior and exterior of the circle. The perimeter of a circle is called the circumference


How many miles in a 21 mile radius?

If the area is a circle and the radius of the circle is 21 miles, the distance around the circle (circumference) is 131.95 miles. The area of that circle is 1,385.4 square miles.