Question

Find the breathe of rectangle whose perimeter is 70cm and lenght is 20 cm​

Answer 1

Answer:

Answer

Perimeter = 200cm

Length = 70cm

P=2(l+b) P=2l+2b

200=2×70+2b

∴2b=200−140

∴2b=60

b=30

Breadth = 30cm

Step-by-step explanation:

Hope my answer would be helpful to you.

Answer 2

$\dag\:\underline{\sf AnsWer :}$

In the given question it is stated that a rectangle whose Perimeter is 70 cm and the Length (l) of the rectangle is 20 cm and here we are asked to find the Breadth (b) of the rectangle.

To find the Breadth of the rectangle we have to use the given below formula :

• Perimeter of rectangle = 2(Length + Breadth)

So, now just plug in the known value in the above formula and then we will get our final answer.

$:\implies\sf Perimeter \: of \: rectangle = 2(Length + Breadth)$

$:\implies\sf 70= 2(20 + B)$

$:\implies\sf 70= 40 + 2B$

$:\implies\sf 70 - 40 = 2B$

$:\implies\sf 30 = 2B$

$:\implies\sf B = \dfrac{30}{2}$

$:\implies \underline{ \boxed{\sf B = 15 \: cm}}$

Hence,the Breadth of the rectangle is 15 cm.

• If we are not sure with the answer we can check our answer :

$\dag \: \underline{\bf VERIFICATION }$

$\dashrightarrow\:\:\sf 70= 2(20 + B)$

$\dashrightarrow\:\:\sf 70= 2(20 + 15)$

$\dashrightarrow\:\:\sf 70= 2(35)$

$\dashrightarrow\:\: \underline{ \boxed{\sf 70= 70}}$

Hence, Verified !