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The least number of squares that must be added so that the line $P-Q$ becomes the line of symmetry is ____________

1. $4$
2. $3$
3. $6$
4. $7$

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A line of symmetry is a line that cuts a shape exactly in half. This means that if you were to fold the shape along the line, both halves would match exactly.

The least number of squares that must be added $= 6.$

So, the correct answer is $(C).$

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