The sides of the quadrangle are 8 cm, 6 cm, 9 cm, 17 cm. Find its perimeter.

The perimeter of any geometric shape is the sum of the lengths of all its sides.
In the problem statement, we are given the lengths of all sides of the quadrilateral.
Let’s write the formula for the perimeter of the quadrangle:
P = a + b + c + d,
where P is the perimeter, a, b, c, d are the lengths of the sides of the quadrilateral.
Substitute the known side lengths into the formula and calculate the perimeter of the quadrangle:
P = 8 + 6 + 9 + 17 = 40 cm.
Answer: the perimeter of the quadrangle is 40 cm.