**How many triangles can you find in this pentagon?**

#### Solution

Since the figure is drawn on a regular pentagon and if we turn it the fifth part of a turn it becomes itself, each triangle we find will be repeated five times, so that we can save some of the work. So we can find 7 different types of triangles that multiplied by 5 give us a total of** 35 triangles**:

Case 1:

Case 2:

Case 3:

Case 4:

Case 5:

Case 6:

Case 7: