Answer:
The correct answer is 81
Step-by-step explanation:
Here are all the perfect squares.
1 2 1 × 1 1
2 2 2 × 2 4
3 2 3 × 3 9
4 2 4 × 4 16
5 2 5 × 5 25
6 2 6 × 6 36
7 2 7 × 7 49
8 2 8 × 8 64
9 2 9 × 9 81 81 Is a perfect square!
10 2 10 × 10 100
11 2 11 × 11 121
12 2 12 × 12 144
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