23. Calculate areas
Answers
Answer:
Area tells us the size of a shape or figure. It tells us the size of squares, rectangles, circles, triangles, other polygons, or any enclosed figure.
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. Knowing the area can be very important. Think of getting a new carpet fitted in a room in your home. Knowing the area of the room will help make sure that the carpet you buy is big enough without having too much left over.
Calculating Area
Area is measured in squares (or square units).
How many squares are in this rectangle?
We can count the squares or we can take the length and width and use multiplication. The rectangle above has an area of 15 square units.
The area of a rectangle is = length x width
Examples of calculating the area of a rectangle
Units for measuring area
We measure area using squares. We use different sizes of squares depending on how big or small an area is.
Example Length of side on Squares Unit
Size of the nail on your thumb Millimeter mm2
Size of piece of paper Centimeter cm2
Size of a room Meter m2
Size of a town Kilometer km2
Don't forget the wee 2
We write square sizes using a small 2 next to the unit.
We write mm2, cm2, m2 , km2, cm2
We can say "63 millimeters squared" or " 63 square millimeters"
We could use small squares to measure large areas. The only problem with this is that we would end up having to use very big numbers. 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.
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.
Answer:
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Step-by-step explanation:
To find the area of a rectangle, multiply its height by its width. For a square you only need to find the length of one of the sides (as each side is the same length) and then multiply this by itself to find the area. This is the same as saying length2 or length squared.