讲解这道题---**Question Stem:** 五、数一数, 下图中有几个三角形。(共6分) (Translation: V. Count, how many triangles are there in the following figures. (Total 6 points)) --- **Figure 1 Description (Left):** * **Type:** Geometric figure. * **Description:** This figure is a large triangle with its apex pointing upwards and its base as a horizontal line segment. * From the top apex, four straight lines extend downwards to the base, dividing the base into five segments. * Additionally, one straight horizontal line segment spans across the interior of the large triangle, connecting its two slanted sides. This horizontal line is located between the apex and the base, and it intersects the four vertical lines originating from the apex. * **Answer Placeholder:** Below this figure, there is a blank space indicated by "( )个" for the answer (number of triangles). --- **Figure 2 Description (Right):** * **Type:** Geometric figure. * **Description:** This figure is a large triangle that is completely tessellated by smaller, equal-sized triangles. The large triangle is divided into a triangular grid. * The division forms three horizontal rows of triangles. * The top row contains one small triangle. * The middle row contains three small triangles. * The bottom row contains five small triangles. * The grid is formed by lines parallel to each of the large triangle's sides, creating a total of 9 small triangles pointing upwards and 3 small triangles pointing downwards. * **Answer Placeholder:** Below this figure, there is a blank space indicated by "( )个" for the answer (number of triangles).