Inside a triangle, the midpoints of the two slanting sides are joined to each other and to the middle of the base, and an upright line runs from the apex to the base. Count the triangles.

Question

Accepted Answer

13. The four smallest pieces are in the middle, around the upright line. Pieces made of two of them, or one corner triangle, give 6. The two halves of the big triangle and the big triangle itself give 3. Total 4 + 6 + 3 = 13 .

Inside a triangle, the midpoints of the two slanting sides are joined to each other and to the middle of the base, and an upright line runs from the apex to the base. Count the triangles.

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