Notice how, as the sectors become smaller, the shape becomes more like a rectangle. Take a circle and divide it into equally sized sectors and rearrange these as shown below. You can find out more about Pi here Example of calculating the area of a circle Explanation of the Area of a Circle Formula Π (pronounced “ pie” and often written “ Pi”) is an infinite decimal with a common approximation of 3.14159. Where r is the radius of the circle and π is the ratio of a circle’s circumference to its diameter. The length and width of a square are the same so we just need to multiply the length by the length. More Examples of Calculating Area Area of a Square You will probably hear more units for measuring area square inches, square feet, square yards, square miles, acres, hectares are all units used for measuring area. For example, a field might be measured at 5,000,000,000 square millimeters when 5,000 square meters would be a much easier size to say, write, and visualize. The only problem with this is that we would end up having to use very big numbers. We could use small squares to measure large areas. We can say “63 millimeters squared” or ” 63 square millimeters” We write square sizes using a small 2 next to the unit. We use different sizes of squares depending on how big or small an area is. The area of a rectangle is = length x widthĮxamples of calculating the area of a rectangle Units for measuring area The rectangle above has an area of 15 square units. We can count the squares or we can take the length and width and use multiplication. Calculating AreaĪrea is measured in squares (or square units). Knowing the area of the room will help make sure that the carpet you buy is big enough without having too much left over. Think of getting a new carpet fitted in a room in your home.
In the real world it tells us the size of pieces of paper, computer screens, rooms in houses, baseball fields, towns, cities, countries, and so on. It tells us the size of squares, rectangles, circles, triangles, other polygons, or any enclosed figure. Example: Subtracting one area from anotherĪrea tells us the size of a shape or figure.Circle Sectors Rearranged – Starting to Look Like a Rectangle.Explanation of the Area of a Circle Formula.Example of calculating the area of a circle.
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