- A78
- B56
- C64
- D72
Step-by-Step Solution
Side 1: 21 up + 15 down = 36. Side 2: 15 up + 6 down = 21. Side 3: 10 up + 1 down = 11. Side 4: 6. Side 5: 3. Side 6: 1. Total .
Answer: A) 78
The big triangle is cut into six rows of small triangles. How many triangles of all sizes can be counted?
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