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The Number of Angles
How many acute angles can be found in the picture below?

Step 1. Mark all the acute angles that are not made by putting angles
together. How many are there?

Step 2. Mark all the acute angles that are made by putting 2 angles
together. How many are there?

Step 3. Mark all the acute angles that are made by putting 3 angles
together. How many are there?

Step 4. Add all the numbers found above.