Question

38.31 mm
The perimeter of the rectangle is 200cm.If its length is 90cm. Then its breadth is​





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Answer 1

Answer:

Breadth=10cm

Step-by-step explanation:

let the breadth be b

perimeter of rectangle=2(l+b)

2(90+b)=200

180+2b=200

2b= 200-180

2b= 20

b=10

Answer 2

Answer:

Given:-

The perimeter of the rectangle is 200 cm. If its length is 90 cm. Then its breadth is

To Find:-

The breadth.

Note:-

●》Perimeter of rectangle = 2 × ( length + breadth ).

●》For finding some unknown numbers, we usually rearranged the term from its side to another and at that time signs are also changed. For example - positive becomes negative, multiple becomes divisional.

Solution:-

Perimeter = 200 cm, length = 90 cm, Breadth = ? ; Let breadth be "x"

☆ According to note first point~

▪︎$Perimeter \ \ of \ \ rectangle = 2 × ( length + breadth )$

▪︎$200 cm = 2 × ( 90 cm + x )$

▪︎$200 cm = 180 cm + 2x$

☆ According to note second ( rearrangement )~

▪︎$200 cm - 180 cm = 2x$

▪︎$20 cm = 2x$

▪︎$\frac{20 cm}{2} = x$

☆ After doing calculations~

▪︎$10 cm = x$

Breadth = x = 10 cm

Checking:-

♤ Let's check that perimeter side = 2 × ( length + breadth ) side or not?

• $Perimeter \ \ of \ \ rectangle = 2 × ( length + breadth ) \ \ ?$

• $200 cm = 2 × ( 90 cm + 10 cm ) \ \ ?$

• $200 cm = 2 × 100 cm \ \ ?$

♤ After doing calculations~

• $200 cm = 200 cm \ \ ?$

♤ Yes!

Hence, proved that breadth = x = 10 cm.

Answer:-

Hence, Breadth of the rectangle = 10 cm.

:)