Length and Width.
Area = Length * Width
because they need to know where to find these things
Its length and its perpendicular height Area = length*height
If you need to find how big something 2-D is you need to know how to find the area of various shapes. If carpeting you need area. You don't think about it but area is very important. Math isn't useless and is very important int he real world.
You cannot find the area of a rectangle if you only know its length. You need to know its width too. Then you multiply its length by its width.
You will need to know the height before you can calculate the base form the area.
To find the diameter of a circle, you will either need to know the area or its circumference. If you know the area: diameter = 2 x squareroot(area / Pi) If you know the circumference diameter = circumference / Pi
First, you nee to know two things. One, you need to know the length of any one side (the base). Two, you need to know the height. The height is the length of a segment perpendicular to the base. if you know those two numbers, you can plug them into the following equation: A=1/2bh, where A is the area, b is the base, and h is the height.
Google helps people find things they need to know
You can find the permeter if you know the length of the sides. You need to add the lengths of all the sides together.
If you're planting a garden and need to buy topsoil, you need to figure out the area of your garden bed, so that you know how much you need to buy. If you're sewing an outfit, you need to find the area of the outfit, so that you know how much fabric to buy. If you're laying new carpet in your house, you need to find the area, so you know how much carpet to buy. It goes on and on. Knowing how to find the area of a given space is a real-world skill that comes in quite handy. Length x Width or Length x Width x Height
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You would need to know the surface area of a cylinder if you are a factory worker at Pepsi. You would need to know the dimensions of the label, so it will fit on the can.