I am a polygon. My number of sides equals the number of standard musical notes in an octave (including sharps/flats, no—standard diatonic notes? Let's use standard diatonic: 7). Wait, let's make it unambiguous: I have the same number of sides as there are primary colors of pigment (red, yellow, blue = 3). What shape am I?
Triangle
There are 3 primary colors of pigment, and a triangle is a polygon with 3 sides.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Easy. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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