For a square or rectangle, it's length x width.
For a triangle, its 1/2 base x height.
A circle is more complex, so go look it up.
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You would find the area of the inside and outside shape (pretending that the inside shape was not in the outside shape). then, you would take the area of the outside shape and subtract the area of the inside shape.
The area is the inside. The perimiter is around. If its a rectangle, to find the area you multiply the lengths of two sides
To find the area of something you have to multiply the lengths and the width.
Multiply the long side of the rectangle's length by itself.
area is the amount inside the object and permeter is the amount outside of it. To find area you do length times width. To find perimeter you add all the sides together.