This bingo card has 16 words: 2πr or πd, 12.5, 18.84, 2 x r, Radius, 7.5, 3.14, Chord, Free!, 10, 34.54, Center, 16, Circumference, π and Diameter.
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With players vying for a you'll have to call about __ items before someone wins. There's a __% chance that a lucky player would win after calling __ items.
Tip: If you want your game to last longer (on average), add more unique words/images to it.