There is no simple answer. You need to calculate (or measure) the length of each side and add them together.
It is different for each shape. A perimeter is the distance around an object and the area is the square units it takes up.
Perimeter is the outside of a shape
Perimeter is the outside. The area is the inside of a shape.
The perimeter of a shape is the distance around the outside. For a shape with straight sides, the perimeter is the sum of the length of the sides. The perimeter of a circle is called the circumference, and is calculated by multiplying the diameter by pi.
The formula for the perimeter of a shape depends on the shape. It is the sum of the lengths of all the sides that enclose the shape.