The length of the rectangle is 15 cm and the width is 3 times less. And the area and pyrometer.

The perimeter of the rectangle is the sum of its length and width multiplied by two (p rectangle = (a + b) * 2); The area of the rectangle is a product of its length on the width (S rectangle = a * b); Since, according to the condition of the problem, the width is 3 times less than the length, then it is necessary to divide the length by 3: 15: 3 = 5 cm – width; Next, we substitute in the formula instead of “a” length, and instead of “b” width; P rectangle = (15 + 5) * 2 = 40 cm; S rectangle = 15 * 5 = 75 cm ^ 2;
Answer: The area is 75 cm ^ 2, the perimeter is 40 cm.