The perimeter of the quadrilateral ABCD is 34 cm, AB = 6cm, the side BC is 2 times

The perimeter of the quadrilateral ABCD is 34 cm, AB = 6cm, the side BC is 2 times the size of the side AB, the sides CD and AD are equal. Calculate the length of the side

1. Let us find what the length of BC is equal to, if it is known that it is twice as large as AB:
6 * 2 = 12 cm.
2. Subtract the sides AB and BC from the perimeter of the quadrangle, we get the sum of the other two sides AD and CD:
34 – 6 – 12 = 34 – 18 = 16 cm.
3. Since the sides AD and CD are equal, we divide the sum of these sides by 2 and get the length of each of these sides:
16 cm / 2 = 8 cm.
Answer: AD side is 8 cm.