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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.

Q: How do you calculate the area and perimeter of shapes?

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You don't. Perimeter is a concept associated with plane figures, not solid shapes.

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.

Yes - even shapes with different area.

Most shapes have different perimeter than area, as far as value.

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.

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You break it up into smaller shapes which are less irregular. If these are more regular, you can calculate their contribution to the perimeter, and their area. You can then add these together.

Legnth of the sides and then you add them up to get the perimeter

You don't. Perimeter is a concept associated with plane figures, not solid shapes.

Yes - even shapes with different 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.

For the area of a square, it is the base x the height, and the perimeter is 2height+2base. For the area of a triangle, it is base x height divided by two. And to find the perimeter you just add up each of the side lengths.

Most shapes have different perimeter than area, as far as value.

There are infinitely many shapes.

yes they can

5x3

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.

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.