If the side of the triangles with lenghts of 7 cm are put together what will be the perimeter of the composite figure

To find the perimeter of the composite figure formed by putting two triangles together, we need to know how the triangles are arranged. However, I'll consider the most common scenario: placing two identical triangles side by side such that they share a side of 7 cm.

### Scenario:
- **Two identical triangles** with sides of 7 cm are placed together along one of their sides (the 7 cm side).

### Composite Figure:
- The perimeter of the new composite figure will consist of the following:
  - The three sides of the first triangle (7 cm each) minus the shared side (7 cm).
  - The three sides of the second triangle (7 cm each) minus the shared side (7 cm).

### Calculation:
- Each triangle originally has a perimeter of \( 7 + 7 + 7 = 21 \) cm.
- Since the two triangles share a side, the total perimeter is:

\[
21 + 21 - 7 = 35 \text{ cm}
\]

Thus, the perimeter of the composite figure is **35 cm**.

Would you like more details or have any questions?

### Relative Questions:
1. What happens to the perimeter if three triangles are placed together?
2. How does the perimeter change if the triangles are arranged to form a different shape?
3. What would be the perimeter if the shared side was 10 cm instead of 7 cm?
4. How would the perimeter change if the triangles were not identical?
5. What would be the perimeter of a composite figure made of four triangles arranged in a square?

### Tip:
When calculating the perimeter of a composite figure, always remember to subtract the shared sides between the shapes to avoid double counting.

Learn how to calculate the perimeter of a composite figure formed by placing two triangles together. Understand the concept of perimeter and how to subtract shared sides to avoid double counting. Suitable for students in Grades 5-6.

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