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 will need to know the height before you can calculate the base form the area.
Area = width x length in order to find width you need to know length
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.
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
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.
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.
on your birthday it is more likely that you will find rare things on a walk.
To Find Volume Of Things You Need Is Length x Width x Higth