Question

find the area of rectangle whose perimeter is 40 cm and breadth 5 cm​

Answer 1

Step-by-step explanation:

Given,perimeter =40 cm

breadthe 'b' = 5 cm

Let length be l cm

So, 2(l+b) = 40cm

2(l+5) = 40cm

l+5= 20cm

l= 15cm

Now , area= l×b

So, Area= 15cm×5cm

Area= 75 cm^2

Answer 2

Answer:

Step-by-step explanation:

Given,

Perimeter of rectangle = 40 cm

Breadth of rectangle = 5 cm

Length of rectangle = ?  (To be Calculated)

Then,

We know that

Perimeter of rectangle means sum of all four sides or 2(length + breadth).

So,

⇒ Perimeter of rectangle = 2(length + breadth)

⇒ 40 cm = 2(length + 5)

⇒ 40/2 = length + 5

⇒ 20 = length + 5

⇒ 20 - 5 = length

⇒ length = 15 cm.

Again,

Area of rectangle means the product of its length and its breadth or length *breadth square unit.

⇒ Area of rectangle = length*breadth

⇒ Area of rectangle = 15*5 cm²

⇒ Area of rectangle  = 75 cm²

Hence, the area of rectangle is 75 cm².