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What is 12.8 times pi?
When you multiply 12.8 times pi the exact answer is12.8 Pi, but you can round off the answer to40.192because pi is about equal to 3.14.
What is pi times r2?
pi times radius or diameter equals are of a cirlce
What is the circumference of a circle with an area of 81 pi square centimeters?
The circumference is 56.55 cm
The radius of a circle is 5 inches What is the circumference of the circle?
Circumference is 2 times pi times radius, so the circumference of this circle is 2 times pi times 5, or 10 times pi. If a decimal answer is needed, pi is approximately 3.14, so C=31.4
The area of a circle is 81 pi square feet What is the radius?
The area is 9 feet. You find the square root of 81 which is 9. I want circumference, not area.
What is the radius if the area of the garden is 81 times pi ft?
The radius is 9 feet because pi*92 = 81*pi
What is pi times eighty one?
3.141592653589793 * 81 = 254.469
What is pi r squared times three to the fourth power?
(pi) R2 x 34 = 81 pi R2
What is the circumference of a circle with an area of 81?
In every circle . . .Area = (pi) x (radius)2Diameter = 2 x radiusCircumference = (pi) x diameterIn this circle, Area = (pi) R2 = 81R2 = 81/piR = sqrt( 81/pi )Diameter = 2 x sqrt( 81/pi )Circumference = (pi) x 2 x sqrt( 81/pi ) = 2 x sqrt( 81 pi ) = 18 sqrt(pi) = 31.9042 (rounded)
If the diameter of a circle is 18 what is the area with pi?
Area of circle: 81*pi square units
What is Pi x 81?
3.14 x 81 = 254.34
How do you find the radius of a circle if area is 81 pi?
Divide the 81 pi by pi, then square root it. (Use the formula for area of circle, which gives 81pi=pi*radius squared, but rearrange to find the radius). i.e. it's the square root of 81
What is the circumference of a circle if the area is 81 pi square feet?
If: pi*radius2 = 81*pi sq ft Then: radius = 9 feet Circumference = 2*pi*9 = 56.549 feet rounded to 3 decimal places
What times equals 81?
How about: 9 times 9 = 81 or 81 times 1 = 81
What did Egyptians use Pi for?
The Egyptians used 256 divided with 81 to calculate pi.
What is the volume of a cylinder with a radius of 9 cm and a height of 8 cm?
648pi. (pi = 3.14159...)Area of a circle = (pi) x (radius squared)= (pi)(9 squared) = (pi)81.Area of a cylinder = area of circle x height.= (pi)81 x 8= 648(pi)
What is 81 divided by pi?
25.7831 (to 4 dp)
