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You don't need to if you can manage to work out the perimeter and area of complex shapes. Most people cannot work easily with shapes other than triangles, quadrilaterals, circles and semicircles. For them (us) it is easier to partition the shape.

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Q: Why would you need to separate a figure into parts to calculate perimeter and area?
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What is a composite figures perimeter?

They are the result of combining shapes, either by adding parts or taking parts away. We calculate the perimeter of composite shapes by splitting them into simpler pieces and then calculating the perimeter of those simpler pieces.


How do you calculate the total area of a figure?

by adding together the area of its parts


How do you figure area when all 4 sides are different?

You need to cut up your figure into several parts in shapes for which we know how to calculate areas, such as squares, rectangles, and triangles. The area of your figure is the sum of the areas of its parts.


How to find the volume of a cylinder with a cone at the top?

Separate them into parts. First calculate the volume of the cylinder, then the cone and then add the results


How to divide a perimeter of square into 4 parts?

Each side of the square is a quarter of the square's perimeter.


What can separate a compound into parts?

Only a chemical reaction can separate a compound into its parts.☻


Does it make sense to add the perimeters of the parts of a composite figure together to find the total perimeter?

Yes and no. You do but you don't count those parts internal to the composite figure For example you take two squares with side of 1. each individual square has a perimiter of 4. if you put them together to form a rectangle with sides 1 and 2 you have a perimeter of 6 not the 8 that the 2 squares have individually. so you have to take away the 2 sides that disappear. Frankly it makes more sense to just add the lengths of the sides of the resultant figure than to play that game of adding then subtracting redundant numbers.


This is to separate a whole into its parts.?

analyze


What are different parts of the parabola?

A parabola is a single curve: it does not have separate parts.


What is the process used to separate the parts of a mixture?

you have to boil it and separate it there you go it'''s separated


How do you do separate trail mix?

You separate the parts of it manually by picking the individual pieces of food out.


What is it when you separate into two parts?

dividing. separating