Discussion
Which one of the following statements is true ?
Answer: B
The true statement is that a regular polygon of 10 sides has 10 lines of symmetry.
A regular polygon with n sides has exactly n lines of symmetry: for even n, lines through opposite vertices and through midpoints of opposite sides. So a regular decagon has 10.
The others are false. A regular hexagon has 6 lines of symmetry, not only 4. A circle has infinitely many, since every diameter is a line of symmetry. An angle has exactly one line of symmetry, its bisector, not two.
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