You add the lengths of all four sides.
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There is no formula: you measure the length of all of the sides. If the kite is bilaterally symmetric, add the lengths along the right or left side and multiply by two, because for side lengths A and B, its perimeter is 2A+2B.
Area of a kite in square units = 0.5 times the product of its diagonals
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2(length + height)= perimeter
Square is a special case of a rectangle and the same formula may be used to find the perimeter