Question

the length of a rectangle is three times its width. it the perimeter is 84m find the length of the rectangle

Answer 1

Answer:

Length of rectangle = 31.5 cm

Step-by-step explanation:

Let breadth be b. Then, if length is l, then, l = 3b.

Perimeter of rectangle = 2(l+b) = 2(3b+b) = 2(4b) = 8b

But, given perimeter = 84 m.

Thus, 8b = 84

or, b = 84/8 = 10.5 cm

Since, l = 3b, l = 3(10.5) = 31.5 cm