Question

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

Answer 1

Answer:

Step-by-step explanation:

perimeter = 120 cm

perimeter of rectangle = 2(l+b)

                              120 = 2 ( 40+b)

                              120/2 = 40+b

                              60 = 40 + b

                               60-40 = b

                                  b = 20cm

area = l multiplied by b

       = 40 multiplied by 20

       = 800cm^2

Answer 2

Answer:

Step-by-step explanation:

Perimeter = 120

Perimeter of rectangle =2 ( l+ b )

120 =2 (40×b)

b=20

Area of rectangle =l×b

40×20=800cm ^200