The area of the circle with a 3 inch diameter is pi*1.5^2 = 7.069 square inches rounded
Area = A
radius of circle = r
pi = 3.14159265
A = pi x r^2
A = 3.14159265 * (1.5) ^ 2
A = 3.14159265 *2.25
A = 7.06858
The area of the circle is pi*1.5^2 = 7.069 square inches rounded
Chat with our AI personalities
Area = pi*14.452 = 655.972 square m to 3 dp
The area of a 6-foot diameter circle is about 28.274 square feet. A = pi r2 (r = 6/2 = 3) A = (3.1416)(32) = approximately 28.274
The area is the same as that of a big 20 ft circle. Assuming the 20 ft refers to the diameter of the circle, its area is 314.159 sq ft (to 3 dp)
We know that the area of a circle is pi * r2. We also know that the circumference of a circle is pi * d. Therefore, when you know the circumference of a circle and want to know the area, divide the circumference by pi to give you the diameter of the circle, divide the diameter by 2 to give you the radius, square the radius and then multiply by pi to get the area. So, 10/pi = 3.183. 3.183/2 = 1.5915. 1.59152 = 2.533 2.533 * pi = 7.958 to 3 decimal places. The area of your circle is therefore 7.958cm2.
Pi is defined as the ratio of the circumference of a circle to the diameter of the circle.Therefore, if you measure the diameter of the circle (call it 'D') then the circumference of the circle is pi times D.To find the area of the circle use the formula Area = pi* D2 /4 .Going one step further, to a sphere, if you measure the radius of the sphere (call it R, where R is half the diameter D), then:1) The surface area of the sphere is Area = 4 * pi * R2 .2) The volume of the sphere is Volume = (4/3) * pi * R3 .