RE: How Many Triangles Are There?

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How Many Triangles Are There?

in mathematics •  8 years ago  (edited)

16 small, 3 made of 9 (one for each corner), and the entire thing. 26?

EDIT: 16 small, 7 made of 4, 3 made of 9, 1 made of 16, so 16+7+3+1=27?

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Heck, maybe the one upside makes 27