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that would be specific to the object involved. for example, if you needed to find the surface area of the inside of a cylinder in an engine, i could help you find out how much that cylinder can displace, helping you find horsepower for that cylinder. then you could multiply that number by the number of cylinders the engine has to give you the total horsepower of the engine.
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What is the use of perimeter?
Find the length of the sides of the object. Good for finding how much fencing you would need to enclose an area.
Why would you need to know how to find the perimeter of an object?
The lengths of each of its sides.
Why would you need to find area?
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.
How do you find the area of an icosahedron?
You would need to divide it into triangles, find the area of each triangle and sum these areas together.
Find the radius using surface area and height?
FIrst we need to know what the object is? Perhaps you mean a cone or a cylinder?
