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Q: What is the circumference of a circle if the area is 81pi?
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What is the diameter of a circle if the area is 81pi?

18


If The exact area of a circle is 81pi square inches what are the radius and diameter of the circle explain?

The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches


The circumference of a circle is 18pi inches Determine the area of the circle?

First we have to find the radius: 2*pi*radius = 18*pi Divide both sides by 2*pi to find the radius: radius = 9 inches Area of a circle = pi*radius2 Area = pi*92 = 81pi or 254.4690049 square inches


What is the area of a circle that has a radius of 9cm?

Using 3.14 as Pi the area of circle is: 254.34


How do you find the area of a circle when the diameter is nine?

pi x (d/2)2 = 81pi/4


How do you fund the circumference of circle when you know the area?

You dived the area by the circumference of the circle.


Is the Area of a circle and circumference of a circle have the same thing?

No,Circumference is like the perimiter and Area is the whole circle.


What is is circumference of a circle is 6.28. What is the area of the circle?

If the circumference of a circle is 6.28 then its area is about 3.138 square units


Is the circumference and area of a circle the same?

The circumference of a circle is the distance arround the edge of the circle. The area of a circle is how big the inside of the circle is.


What is the formula for finding circumference and area of a circle?

Circumference of a circle is (pi * diameter). Area of a circle is (pi * r2).


What is the area of a circle that has a circumference of 16 PI?

The area of a circle that has a circumference of 16pi is: 201.1 units2


If the area of a circle is 28.26 what is the circumference?

If the area of a circle is 28.26 the circumference is: 18.84 units.