Multiple choice general knowledge math & puzzles

What is the formula for the area of a circle?

  1. R pi squared

  2. 2 pi squared

  3. 2 pi r

  4. Pi r squared
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The area of a circle is πr², where r is the radius. Option D 'Pi r squared' correctly expresses this formula. Options A and B don't include the radius variable properly, and option C (2πr) is actually the formula for circumference, not area. The area formula can be derived by dividing a circle into infinitesimal sectors and rearranging them into a rectangle.

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