# Find each side of a quadrilateral if its perimeter is 54 cm and the sides are 3: 4: 5: 6.

Given:
ABCD – rectangle,
AB / BC / CD / DA = 3/4/5/6,
P avcd = 54 centimeters.
Find the lengths of the sides of the rectangle: AB, BC, CD, DА -?
Solution:
1) Consider a rectangle ABCD. Let the length of the side AB = 3 * x centimeters, the length of the side BC = 4 * x centimeters, the length of the side CD = 5 * x centimeters, the length of the side DA = 6 * x centimeters. We know that the perimeter of the rectangle is 54 centimeters. Then
3 * x + 4 * x + 5 * x + 6 * x = 54;
18 * x = 54;
x = 54: 18;
x = 3;
2) 3 * 3 = 9 centimeters – AB;
3) 4 * 3 = 12 centimeters – BC;
4) 5 * 3 = 15 centimeters – CD;
5) 6 * 3 = 18 centimeters – DA.
Answer: 9 centimeters; 12 centimeters; 15 centimeters; 18 centimeters. One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.