Multiple choice general knowledge math & puzzles If a circle is one, how many is an octagon? 2 4 6 8 12 Reveal answer Fill a bubble to check yourself D Correct answer Explanation The question relates the name of the shape to a number. A circle is often associated with 1 (one continuous line), and an octagon is defined by having 8 sides and 8 angles, making 8 the logical answer.