P= Add all sides A= LxW
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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.
Perimeter = 4 times the square root of the area.
Area: 1/2πr2 Perimeter: 1/2πd+d
Perimeter: add all sides area: multiply length times width for rectangles
156 It is impossible to calculate the area of a rectangle from its perimeter if no other dimension is known. The area of a rectangle is the product of its length and width, and the perimeter is twice the sum of its length and width.