What is the approximate area of a circle with a radius of 3 feet?
919539
Area =pi (Radius)^2 = 22/7(3)^2 =22(9)/7 = 28.29 ft^2 Ans.
71470
3.1416 X radius squared\n12" circle= 6" radius\n6" X 6" = ? X 3.1416(pi)= ?\nGot the picture?\nNot going to do your homework for you.\n\n(sorry Lucky Lady but pi X diameter is the circumference)
549743
Area increases 4 times. Beacause Area of circle = PiR2.\n\nSo if R doubles then radius will be 2R.\n\nHence area will be Pi(2R)2. which results into\n\n4 Pi R2.
369376
Area of a circle = pi * r^2\n= pi * 118^2  <--take half of 236 mm to find the radius\n= 43744 mm^2\n\nArea of a square = s^2\n43744 = s^2\ns = 209 mm\n\nSo your square has to have sides of 209 mm if it will have the same area as the circle above.
598391
First find the area of the circle that is on the top or bottom of the cylinder. The area formula for a circle is \n\n"pi,r squared. That means multiply pi times the radius of the circle which you have to square first.\nThen you take the number that you get and multiply it by the height of the cylinder.\nGood luck.
408251
Measure the diameter and multiply by pi (3.1415)
246446
Y'all didn't answer the question! You just found the length of the sides. :)\n\nThe largest square that will fit inside has it's 4 corners touching points on the circle.  If the radius is 10 feet, then the diameter is 20 ft.  The diameter is also the diagonal of the square with side length x, and is therefore the hypotenuse of a 45-45-90 right triangle.\n\nx^2 + x^2 = 20^2\n2x^2 = 400\nx^2 = 200\n\nThat's as far as you have to go, since the area of the square is length (x) times width (x), or x^2\n\n~*~*~So the area of the largest square is 200 sq feet.~*~*~
1150077
Any length greater or equal the circumference of a 1-acre circle. \n\nCalculate the acre as square feet, square yards or square meters.\n\nDivide by pi and calculate the square root to get the radius, then multiply by 2 pi for the circle circumference.
229888
So 2*pi*radius = circumference.  And you know the circumference, so set up a little equation and solve for the radius.\n2 pi R = 4 pi\ncancel the 2 and the pi to get\nR = 2\nNow you can easily find the area using Area = pi * R^2
692007
its quite simple the radius is half way threw the circle so its the radius 3 squared which equals 9 and 9 times pi or 3.14 equals 88.7364 but u mite have to round it so if u round to a whole number it would be 89 but to the nearest tenth it would be 88.7
1088174
area = pi times the radius squared\n\nThe diameter is twice the radius.\n\nSo divide the diameter in two, square that and multiply by pi.
62748
When you square a number you are multiplying it by itself.  For example 3ft x 3ft = 9 square feet or 3 squared = 9.  But if you had a real square (a box top with equal sides like a huge pizza box) and each side was 3 feet, the area of the box would be 3ft x 3ft = 9 sq-ft.  You can think of squaring a number as the geometric operation of taking the sides of a square and multiplying them to get the square area as shown.\n\nTaking a square root is just the opposite.  You start with the square area of the box top and find the sides.  If the box top is 9 square feet you want to know the value of any two sides (the other two sides will be the same).  a square area of 9 sq-ft = 3ft x 3ft.  There are methods for calculating square feet or it can be done using a hand calculator, but it helps to know what is really going on.\n\nWhen you square a number or find the square root of a number you can also use pure numbers (3 or 9 rather than 3ft or 9 sq-ft) and there doesn't need to be any real pizza box involved even though you use the word "square."  Good luck.
193691
area = r^2 * pi\narea = 9.8^2 * 3.1415\narea = 96.04 * 3.1415\narea is about 301.71
695183
area of a circle = Пr²\ndiameter = 2.5\n\ntherefore radius = 1.25\n\ntherefore the area = 1.25² x П\n\narea = 4.9087...cm²
1048814
If the circles are concentric, just subtract the area of the smaller circle from the larger circle:\n\nArea of small:  6*6*pi\nArea of large:  9*9*pi\n\nDifference of areas = 81*pi   -    36*pi  =  45*pi = 45 * 3.14159  = \n\n141.37 square units
181035
a circle's circumference is define as 2Pi x Radius\n\nin this case 2 x 3.14... x 3 so your answer is c
711674
the circumference of a circle is the diameter * pi.\n\nor...\n\nC = d * 3.14