Question

2. Find the length of a rectangle whose breadth is 30 cm and perimeter 200 cm.​

Answer 1

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:

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Answer 2

Answer:

70 cm

Step-by-step explanation:

Let, the length of a rectangle is x

∴ According to the formula,

               2 * (x + 30) = 200

          => x = (100 - 30) = 70 cm