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Multiple choice

What is the maximum area of a rectangle, the perimeter of which is 18 cm?

  1. $20.25 cm2$
  2. $20.00 cm2$
  3. $19.75 cm2$
  4. $19.60 cm2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For a fixed perimeter, a rectangle achieves maximum area when it is a square. With perimeter 18 cm, each side of the square is 18/4 = 4.5 cm, giving area 4.5 × 4.5 = 20.25 cm².

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