Question

The perimeter of a rectangular plank is 120cm.if the length is 40cm,find its breadth and surface area of the plank

Answer 1

Answer:Given that area of rectangular plank = 120 cm

length, "l" = 40 cm

TO FIND : Breadth "b" and the  SA.

Step-by-step explanation:

Now,

perimeter = 120

or, 2(l + b) = 120

or, 40 + b = 60

or, b = 20 cm

Now ,we know that surface area of a rectangle = l x b

or, 20 x 40 = 800 cm²

This is the answer.