4. On graph paper, large and small triangles are drawn (all cells are square and of the same size). How many small triangles can be cut out from the large triangle? The triangles cannot be rotated or flipped (the large triangle has a right angle at the bottom left, the small triangle has a right angle at the top right).
Answer: 12.

Solution. See the figure.
![](https://cdn.mathpix.com/cropped/2024_05_06_ebb4e2d023c22aa51ba3g-7.jpg?height=1174&width=1122&top_left_y=342&top_left_x=800)

Comment. Correct drawing with 12 triangles - 20 points. Incorrect answer with drawing - 1 point. Any answer without drawing - 0 points.