To find the perimeter of any shape, simply add the lengths of the individual line segments together. To find the length of an individual line segment (x1,y1)-(x2,y2) simply compute the square root of (x1-x2)2 + (y1-y2)2.
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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.
multiply and divide by 2
You find perimeter by adding all the sides of a figure.
count the grids
All you do is add up all the sides to find the perimeter even though it is a odd shape