Question

find the breadth of a rectangle whose length is 70 cm and perimeter is 200 cm.

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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

Answer 2

Answer:

Perimeter of rectangle = 2(l+b)

Here, Length =70cm

Let the breadth of rectangle be x

So,

→ Perimeter of rectangle = 2(70+x)

→200 = 140+2x

→200-140 = 2x

→60 = 2x

→ x = 60/2

→ x = 30cm

So, it's breadth is equal to 30cm

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