@dailymathvisuals: How many triangles do you see in this figure? Pause and count carefully. Most people stop at 16 — just the small ones. The real answer is 27. The trick is to count by size, and don't forget the upside-down triangles. Ten small upward, six small downward, six medium upward, one medium downward, three large, and the whole figure itself. That's twenty-seven total. And it keeps growing. If the side is split into five parts, you get forty-eight triangles. Ten parts per side gives three hundred and fifteen. The closed form is T of n equals the floor of n times n plus two times two n plus one, divided by eight. Triangles grow much faster than the eyes catch. Follow @dailymathvisuals for daily visual math. Shop: dailymathvisuals.lemonsqueezy.com #math #geometry #puzzle #howmanytriangles #mathtok #stem