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

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Solution

Perimeter = $200 c m$

Length = $70 c m$

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

$200 = 2 \times 70 + 2 b$

$∴ 2 b = 200 - 140$

$∴ 2 b = 60$

$b = 30$

Breadth = $30 c m$

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