Problema Solution
In a rectangular wallet photo, the width is 7cm smaller than the length If the border (perimeter) of the photo is 34cm, Find the length and width
Answer provided by our tutors
The opposite sides of rectangles are equal. You have 2 widths (W)of the same size and 2 lengths (L) of the same size. If you add up all the sides of a figure, you get its perimater (P). Therefore, the formula for the perimeter of a rectangle is:
P=W+W+L+L
P=2W+2L
P=34 cm
L=x
W=x-7
Substitute these values into the formula for the perimeter of a rectangle and you get:
34=2(x-7)+2x