The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle, or any two points on the circle as long as they are exactly 180 degrees apart. This is the diameter of a circle that corresponds to the specified area. The formula used to calculate the circle diameter is:Įnter the area contained within a circle. This tool will calculate the diameter of a circle from the area, and will convert different measurement units for area and diameter. You can also see at the bottom of the calculator, the step-by-step solution. To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator.
Sphere surface area to diameter calculator 4870.11 square inches (in) Use the this circle area calculator below to find the area of a circle given its radius, or other parameters. For instance, we can calculate the surface area of a sphere, a cone or even the surface area of a cylinder. Circle circumference to diameter calculator Surface area is the sum of all the areas of all the shapes that cover the surface of an object. Therefore the contractor should purchase the paint for the mini roundabouts from Boys & Boden. The radius of a circle calculator uses the following area of a circle formula: Area of a circle r 2. Stage 3 – Work out the cost for the required number of paint tins from the suppliers. So this supplier does not have enough tins in stock to paint all the mini roundabouts. Stage 2 – Now work out how many tins would be required from each supplier to paint all the mini roundabouts. Here is a three-tier birthday cake 6 6 inches tall with a diameter of 10 10 inches. Thus, if there were a total of 28.26 squares, the area of this circle would be 28.26 cm 2 However, it is easier to use one of the following formulas: or where is the area, and is the radius. The formula for area, A A, of a circle with radius, r, and arc length, L L, is: A (r × L) 2 A ( r × L) 2. If each square in the circle to the left has an area of 1 cm 2, you could count the total number of squares to get the area of this circle. Formula: The area of the circle can be determined by the given formula. It is denoted by A and measured in the square unit, such as m 2, cm 2, etc. Therefore area of each mini roundabout = `\pi\times2^2 = 12.57m^2` You can also find the area of a sector from its radius and its arc length. The area of a circle is defined as space or the region it occupies in a two-dimensional plane. Radius = half diameter so each mini roundabout has a radius = `4÷2 = 2m` Stage 1 - First work out the area to be covered by all the mini roundabouts From which supplier should the contractor purchase the paint? The purchasing manager at the contractors contacts 3 suppliers to check prices stock levels and coverage per tin of paint as shown in the table below. One pack of grass seed will not be enough to reseed the centre circle of the football pitch.Ī council contractor has been asked to paint 20 mini roundabouts each with a diameter of 4m. Therefore the area of the centre circle `=\pi\times\9^2=\pi\times81=254.5m^2` 
Definition: The number of square units it takes to fill a segment of a circle Try this Drag one of the orange dots that define the endpoints of the segment. Area of a Circle Segment Given the Central Angle. For the sample circle with radius,, then. Area of a circular segment and a formula to calculate it from the central angle and radius. 2 Do not get confused and square the entire equation. The grounds keeper has seen they can buy a pack of grass seed that will cover an area of 150m 2 but if the centre circle has a radius of 9 metres will one pack be enough? The formula to find the area of a circle is, where the variable represents the radius.
The grass in the centre circle of a school’s football pitch has died. So to remember these formula the following will help: The area of a circle `=\pi\times\radius\times\radius` The circumference of a circle `=\pi\timesdiameter` Remember the circumference and area of a circle formula
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