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To calculate the area you multiply the width times lenghth.the numbers that are on the side of the shape multiply them and you'll get the area. Now to get the perimeter you add the numbers on the sides together. Add lenght times width.that's how you get your perimter and area.
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How do you calculate the perimeter of the cone?
You don't. Perimeter is a concept associated with plane figures, not solid shapes.
Can two shapes have the same perimeter?
Yes - even shapes with different area.
Can a shape have the same area but not perimeter?
Most shapes have different perimeter than area, as far as value.
Why would you need to separate a figure into parts to calculate perimeter and area?
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.
What is geometry as a subject?
it's a subject because it explains about all types of shapes that you can know and it also teaches you how to calculate the area and perimeter of the shape that you are finding.
