Question

Qus.3 The perimeter of rectangle is 20cm. If the length of rectangle is 6 cm, then its breadth will be

Answer 1

Answer:

Let breadth be b

then...

2(l+b)=20

=>2(6+x)=20

=>12+2x=20 (open the brackets)

=>2x=20-12

=>2x=8

=>x=8/2

=>x=4

Verification:-

if

breadth = 4cm

length = 6cm

perimeter = 2(l+b)

                 = 2(6+4)

                 =2x10

                 = 20cm

hence verified

hope this helps... :)

Answer 2

Given :

• Perimeter of Rectangle = 20cm
• Length of Rectangle = 6cm

To Find :

• Breadth of Rectangle.

Solution :

$\longmapsto\tt{Length=6cm}$

$\longmapsto\tt{Perimeter=20cm}$

Using Formula :

$\longmapsto\tt\boxed{Perimeter\:of\:Rectangle=2(l+b)}$

Putting Values :

$\longmapsto\tt{20=2(6+b)}$

$\longmapsto\tt{\cancel\dfrac{20}{2}=6+b}$

$\longmapsto\tt{10-6=b}$

$\longmapsto\tt\bold{b=4cm}$

So , The breadth of Rectangle is 4cm...

_______________________

VERIFICATION :

$\longmapsto\tt{20=2(l+b)}$

$\longmapsto\tt{20=2(6+4)}$

$\longmapsto\tt{20=2(10)}$

$\longmapsto\tt\bold{20=20}$

HENCE VERIFIED