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The image shows a mathematical set definition:

\[
B = \{ x \mid x \text{ is a perfect square number between 1 to 20} \}
\]

To solve this, we need to list the perfect squares between 1 and 20. A perfect square is a number that can be written as \( n^2 \), where \( n \) is an integer.

The perfect squares in this range are:
- \( 1^2 = 1 \)
- \( 2^2 = 4 \)
- \( 3^2 = 9 \)
- \( 4^2 = 16 \)

Therefore, the set \( B \) is:
\[
B = \{1, 4, 9, 16\}
\]

Would you like more details or have any questions about perfect squares or set notation? Here are some related questions to expand your understanding:

1. What are the next five perfect squares after 16?
2. How can you find whether a given number is a perfect square?
3. What are the properties of perfect squares?
4. What is the difference between perfect squares and prime numbers?
5. Can negative numbers be perfect squares?

**Tip:** A quick way to check if a number is a perfect square is to find its square root and check if the result is an integer.

B = { x | x is a perfect square number between 1 to 20 }

Understand how to find the perfect square numbers between 1 and 20. This problem introduces set theory and perfect squares, with a focus on key mathematical concepts such as square numbers and their properties. Suitable for students in Grades 5-7.

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