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GATE BT 2023 | GA | Question: 5

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4 4 votes

A line of symmetry is defined as a line that divides a figure into two parts in a way such that each part is a mirror image of the other part about that line.

The given figure consists of $16$ unit squares arranged as shown. In addition to the three black squares, what is the minimum number of squares that must be coloured black, such that both $\mathrm{PQ}$ and $\mathrm{MN}$ form lines of symmetry? (The figure is representative)

  1. $3$
  2. $4$
  3. $5$
  4. $6$

2 Answers

1 1 vote


These 5 blocks need to be coloured.

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