GATE ME 2025 Set 1 — Question 9
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General Aptitude → Spatial Aptitude → Transformation of Shapes (Translation, Rotation, Scaling, Mirroring)
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Question
Which one of the following options has the correct sequence of objects arranged in the increasing number of mirror lines (lines of symmetry)?
Correct answer
(B) Isosceles triangle; Equilateral triangle; Square; Circle
Solution
Let's count the lines of symmetry for each object:
- Isosceles triangle: 1 line of symmetry (the altitude to the base).
- Equilateral triangle: 3 lines of symmetry (the three altitudes).
- Square: 4 lines of symmetry (two diagonals and two lines connecting midpoints of opposite sides).
- Circle: Infinite lines of symmetry (any diameter).
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