It is not possible to do so.
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You find perimeter by adding all the sides of a figure.
All you do is add up all the sides to find the perimeter even though it is a odd shape
To find the perimeter and areas of complex shape without a grid you should divide the shape into simple shapes and find the area of each shape alone and then add up the areas all together to get the area of the whole shape. Example: If there is a shape that can be divided into 2 triangles and 1 rectangle then you will find the area of each triangle alone and then the area of the rectangle then add up all the areas together.
The perimeter of a shape does not determine its area. The shape can be made thinner without changing its perimeter but reducing its area.
When the shape is a circle, then the perimeter is called"circumference".The circumference IS the perimeter of a circle.