To find the area of a square, rectangle, parallelogram:
Multiply the base by the height.
To find the area of a triangle:
Multiply the base by the height then divide it by 2.
To find the area of a circle:
Multiply 3.14 by the radius, then multiply by the radius again.
To find the area of a trapezoid:
Add b1 by b2, then multiply the sum of b1 and b2 by the height, then divide by 2.
b1=upper base
b2=lower base
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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.
Shape of what ?
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.
Such as? If you can break the shape up into triangles you can find the area that way. Or, you can get into calculus-based equations if you have an equation for the random shape.
You times the length by width, to get the area of the 2D shape.