根据图片中的问题，数三角形，请采用数形结合的方法，数出所有的三角形。并出一道跟进练习。---**Textual Information:** * **Title:** 数图形。 * **Question Stem:** 下图中共有 ( ) 个三角形。 **Chart/Diagram Description:** * **Type:** Geometric figure. * **Main Elements:** The figure is composed of intersecting straight lines within a rounded rectangular frame. * There are two horizontal lines. * There are multiple slanted lines creating a pattern of interconnected triangles. * The structure forms a grid of smaller triangles arranged in two rows. The top row consists of triangles pointing upwards and downwards, and the bottom row consists of triangles pointing downwards and upwards. The lines create larger triangles by combining smaller ones.