A rectangle has a perimeter of 70 cm and one of its sides is 15 cm. What is its area?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 300 cm2
The perimeter is \(2(l+b)\), so half the perimeter is the sum of the two sides; that gives the other side, and area \(=l\times b\).
\(l+b=70\div2=35\)
Other side \(=35-15=20\) cm
Area \(=15\times20=300\) cm2