Question

3. Find the perimeter of a 30 cm long rectangle given
that its area is 450 cm?.​

Answer 1

Given

Length of Rectangle is 30cm

Area of Rectangle is 450cm²

To Find

Perimeter of Rectangle

$\sf\huge\bold{\underline{\underline{{Solution}}}}$

Area of Rectangle =length ×Breadth

Perimeter of Rectangle= 2(l+b)

[where l=length ,b= Breadth]

First we apply area formula from here ,we can find breadth.

Area of Rectangle =length ×breadth

=>450=30×breadth

=>450/30=breadth

=>45/3=breadth

Breadth =15cm

Now ,we find the breadth and length is given so we can easily find out the perimeter:

Perimeter of Rectangle =2(l+b)

Perimeter of Rectangle=2(30+15)

perimeter of Rectangle=2(45)=90cm

Answer 2

Answer:

area of rectangle= lenght × breadth

=>450cm²=30× breadth

=>15cm= breadth

perimeter of rectangle= 2(lenght + breadth)

=>2(30+15)

=>2×45

=> 90cm