Multiple choice general knowledge math & puzzles

If the diameter of a circle is increased by 100 %, find the % increase in the area.

  1. 200

  2. 300

  3. 100

  4. 250
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If diameter increases by 100%, it doubles (2x). Since area is proportional to the square of the diameter (or radius), the new area is 2 squared, or 4 times the original. A 4x increase in area represents a 300% increase (400% - 100% = 300%).

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