The rectangles on a quilt are 4 in. wide and 5 in. long. The perimeter of each rectangle is made by a pattern of green thread. If there are 40 rectangles in the quilt, how much green thread is needed?
Are the rectangles all joining each other? On how many sides? Or are all rectangles separate?
It doesn't say.
Ok. Let's assume that you need the green thread around each of the rectangles.
P = 2L + 2W
P = 2(4) + 2(5)
P = 18 cm for each rectangle
18 * 40 = ?
To find out how much green thread is needed, we first need to calculate the total length of thread required for each rectangle.
The perimeter of a rectangle is calculated by adding the lengths of all four sides. In this case, the width is 4 inches and the length is 5 inches.
The formula to calculate the perimeter of a rectangle is: P = 2 * (L + W)
Plugging in the values, we get: P = 2 * (5 + 4) = 2 * 9 = 18 inches.
Now that we know the perimeter of one rectangle, we can calculate the total length of green thread required for the entire quilt.
Since there are 40 rectangles in the quilt, we multiply the perimeter of one rectangle by the number of rectangles: 18 inches * 40 rectangles = 720 inches of green thread.
Therefore, 720 inches of green thread are needed for the quilt.