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The image shows a question about a square with an area of 81 square units. To solve this, you need to find the side length of the square.

1. **Formula for the area of a square:**
   \[
   \text{Area} = \text{side length}^2
   \]
   
   In this case, the area is 81, so:
   \[
   \text{side length}^2 = 81
   \]

2. **Solve for the side length:**
   Take the square root of both sides to find the side length:
   \[
   \text{side length} = \sqrt{81}
   \]

   Since \(\sqrt{81} = 9\), the side length of the square is 9 units.

Would you like more detailed steps or explanations on square roots or other related topics?

Here are 5 related questions:
1. How can we calculate the square root of any number manually?
2. What is the area of a square with a side length of 7 units?
3. How is the concept of square roots applied in real-world problems?
4. What is the cube root of 81?
5. How do we find the side length of a rectangle if only the area and one side are known?

**Tip:** Always check that the square root is positive for side lengths since a side length cannot be negative.

The area of a square is 81 square units. What is the side length of the square?

Learn how to find the side length of a square when given its area of 81 square units. This problem demonstrates the use of square roots and basic geometry concepts. Suitable for students in Grades 6-8.

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