What is the area (in cm2) of a rectangle having perimeter 48 cm and breadth 10 cm?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 140
The perimeter of a rectangle is \(2(l+b)\), so the length is found from the perimeter first; the area is then \(l\times b\).
\(2(l+10)=48\), so \(l+10=24\) and \(l=14\,\mathrm{cm}\)
Area \(=14\times10=140\) cm2