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Q: How do you work out the area of a circle given the diameter?

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The perimeter of a full circle (circumference) is "pi" times the diameter. So the perimeter of a semi-circle will be half that; Perimeter = (pi/2) x (diameter).

To find the circumference of a circle, you have to multiply Pi and the Diameter. This means that to work out the answer you multiply Pi by 1.25. This equals 3.92699081, which rounded equals 3.93 (2dp) - the circumference of a circle with a 1.25 diameter.

It depends on what information you do have. If you know the radius, simply double it.

The formula for working out the circumference of a circle is:pi (3.14) x diameterORpi (3.14) x 2 x radiusThe diameter of a circle is the length of a line that goes right through the middle of the circle and touches on both sides.The radius of a circle is half of the diameter.

Pi times the square of the radius.

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Circumference of a circle = diameter*pi Diameter of a circle = circumference/pi

By dividing the diameter by 2 will give the circle's radius. Area of any circle = pi*radius squared.

depends on the information given, but radius is half of the diameter.

If you're only given the length of the arc, then you can't. You also need to know the fraction of the circle that's in the sector. You can figure that out if you know the angle of the arc, or the radius or diameter of the circle. -- Diameter of the circle = 2 x (radius of the circle) -- Circumference of the circle = (pi) x (Diameter of the circle) -- (length of the arc)/(circumference of the circle) = the fraction of the whole circle that's in the sector or -- (degrees in the arc)/360 = the fraction of the whole circle that's in the sector -- Area of the circle = (pi) x (radius of the circle)2 -- Area of the sector = (Area of the circle) x (fraction of the whole circle that's in the sector)

The formula for the area of a circle is pi x radius2. The radius is half the diameter, and the diameter of an inscribed circle is the same as the length of a side of the square.The formula for the area of a circle is pi x radius2. The radius is half the diameter, and the diameter of an inscribed circle is the same as the length of a side of the square.The formula for the area of a circle is pi x radius2. The radius is half the diameter, and the diameter of an inscribed circle is the same as the length of a side of the square.The formula for the area of a circle is pi x radius2. The radius is half the diameter, and the diameter of an inscribed circle is the same as the length of a side of the square.

Given the diameter of the circle, multiply it by π (approx 3.14159).

area = pi*radius2Remember, to half the diameter to get the radius.Get the area of the outside circle, and the area of the inside circle, then take the inside area from the outside.I think it would be more helpful to you not to give you the answer. Work it out from this. If you are wondering what pi is, it is 3.14159

Assuming you know the radius or diameter...(Pi) x (radius) x (radius) or (1/4 Pi) x (diameter) x (diameter) will give you the area.

The circumference of any circle divided by its diameter is always equal to pi. With this information we can work out various properties of the circle such as its circumference or its area.

Area of a circle = pi*radius2 measured out in square unitsfor pi use this number 3.14159and remember the radius of a circle = half the diameter.----------------------------------------------------------------Thus a circle with a 10 inch diameter would have an area of:Radius = diamiter/2, which is 10/2= 53.14159 * (5*5) = 78.53975 square inches

Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.

The circumference of a circle is the distance around the circle. The formula is: C = pi * d (where pi = 3,1416 and d is the diameter) The diameter of a circle is the distance across the circle. The radius of a circle is one-half of the diameter The area of the circle is the amount of space contained within the circle. To calculate, the formula is: A = pi * r-squared (where pi = 3.1416 and r-squared is the radius multiplied by itself)

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