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The Number of Right Triangles
How many right triangles can be found in the figure below?

Step 1. The following figure is divided into six pieces. Find all the right
triangles and write the numbers.

Step 2. Write the numbers of the two pieces that make a right triangle when
put together.

Step 3. Write the numbers of the three pieces that make a right triangle
when put together.

Step 4. How many right triangles can be found in the figure?
   160   161   162   163   164   165   166   167   168   169   170