The perimeter of the rectangle ABCD is 40 dm. The length of the rectangle is 12 cm. Find the width of the rectangle.

40-12-12 = 16 (two widths) – based on the perimeter formula
16: 2 = 8 (rectangle width)
Verification:
12 + 12 + 8 + 8 = 40
Answer: the width of the rectangle is 8



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.