Question

What is the least number of squares that must be added so that the line PQ becomes a line PQ becomes a line of symmetry?

• A. $5$
• B. $3$
• C. $4$
• D. $1$

Answer 1

The correct option is C $4$

in the diagram for symmetry quares corresponding to red marked squres are missing.

so $4$ squares are required minimum to complete symmetry