Area of a circle = pi*radius2 Radius = diameter/2
A semicircle is 1/2 of a circle. Find the area with the diameter you are given as if you had a whole circle, then divide that answer by 2 to get the area of the semicircle.
If the area of a circle is given as 67cm squared, the diameter is 9.236 cm and the circumference is 29.02 cm
A = pi x d2 / 4
TTr2 [Pi r squared] finds the area of the circle. TT x d [Pi x diameter] finds the circumference of a circle]
Diameter of a circle = circumference/pi
By using the other information supplied about the circle to calculate either its radius (from which its area can be calculated) or its area (if the circle is similar to another with a given area and some ratio between the two circle is given):If the diameter is given: radius = diameter ÷ 2If the circumference is given: radius = circumference ÷ 2πIf the circle is similar to another circle which has a given area, and the length ratio is given; square the length ratio to get the area ratio and apply to the given area.
To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
Area = pi*r2 where r is the radius. Since r = diameter/2, then area = pi*d2/4
Circumference= 3.14 x Diameter Area of circle= 3.14 x diameter x diameter
Diameter is 8.64444
Divide the diameter by 2.
if you are given a diameter divide it by two to get the radius! From then on, it is just simple Pi R Squared
If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.
The area of a circle with a diameter of 6 units is: 28.27 square units.
In order to find the diameter of a circle if you have the area is to rearrange the formula for the area of a circle to put diameter as the unknown, like so: PIE*d = Area of a Circle d = (Area of a Circle) / PIE Therefore if the area of your circle is 40cm, 40/PIE = 12.73cm and that's the diameter.
A=(pi)r2 d=2r Divide the given area by pi(3.14) and take the square root. This is the radius so multiply by 2 to get the diameter.
divide the diameter by 2 and square the number you just got and then multiply it by pi
The area of a circle is (pi) times (the radius)2. The radius of the given circle is 1/2 of the diameter = 20m. Area = (pi) times (20)2 = 400(pi) = 1,256.64 square meters(rounded)
depends greatly on the thing you are working with. assuming a circle with area A the diameter is 2*sqrt(A*pi) since A =r*r*pi and diameter=2*r
Area = 1/4 of (pi) x (diameter)2
The Perimeter of a circle is it's circumference. And the circumference is the diameter times pi. So to find the area, divide the circumference by pi, and get the diameter. Then divide the diameter by 2, to get the radius. Then multiply the radius times itself, and multiply that by pi.
Double the radius