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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.

Yes - even shapes with different area.

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

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.

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.

There are infinitely many shapes.

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

yes they can

5x3

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.

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.

The perimeter of a triangle does not provide sufficient information to calculate its area.

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