1. A line parallel to the selected side of a triangle with an area of 16 cuts off a smaller triangle with an area of 9. Find the area of the quadrilateral, three vertices of which coincide with the vertices of the smaller triangle, and the fourth lies on the selected side. Choose the answer option with the number closest to the one you found.
Answer: 12. (C)

![](https://cdn.mathpix.com/cropped/2024_05_06_931339780e33dfccbc0eg-1.jpg?height=65&width=795&top_left_y=864&top_left_x=682)