Question

Длина прямоугольнтка в три раза больше его ширины чему равен периметр прямоугольника если его ширина равна 9 см?2 дм? Как её вообще понять?

Answer 1

Р=2(9+9*3)=72см
Р=2(20+20*3)=160см или 16дм

Answer 2

Understanding the Problem

To find the perimeter of a rectangle when its width is 9 cm, we can use the formula for the perimeter of a rectangle, which is P = 2 * (length + width). Given that the length of the rectangle is three times its width, we can use this relationship to calculate the length and then find the perimeter.

Calculating the Length of the Rectangle

The width of the rectangle is given as 9 cm. Since the length is three times the width, we can calculate the length as follows: Length = 3 * Width Length = 3 * 9 Length = 27 cm

Calculating the Perimeter of the Rectangle

Now that we have the length and width of the rectangle, we can calculate its perimeter using the formula: Perimeter (P) = 2 * (Length + Width) P = 2 * (27 + 9) P = 2 * 36 P = 72 cm

So, the perimeter of the rectangle, when its width is 9 cm, is 72 cm.

This calculation is based on the formula for the perimeter of a rectangle and the given relationship between the length and width of the rectangle.