Question: what is the formula to find the perimeter of a quadrilateral?
Answer: The formula to find the perimeter of the quadrilateral = sum of the length of all the four sides. Here the lengths of all the four sides are 5 cm, 7 cm, 9 cm and 11 cm. 2. The perimeter of the quadrilateral is 50 cm and the lengths of three sides are 9 cm, 13 cm and 17 cm.