Question

11. The perimeter of a rectangle is 120 cm. and it length is 40 cm. Find the
area of the rectangle.​

Answer 1

Answer:

area of perimeter

2(L + B) = 120

2(40 + B) = 120

40 + B = 60

B = 20

area of rectangle

(L×B)

40×20

800

Answer 2

Answer:

$800cm^{2}$

Step-by-step explanation:

Perimeter = 120cm

Length = 40cm

Perimeter of rectangle = 2 (Length + Breadth)

Therefore:

120cm = 2 (40cm + Breadth)

120cm = 80cm + (Breadth x 2)

Breadth  x 2 = 120cm - 80cm

Breadth = $\frac{120-80}{2}$

Breadth = 20cm

Area of rectangle = Length x breadth

Therefore, Area = 20cm x 40cm

                           = $800cm^{2}$