B.A regular polygon of 10 sides has 10 lines of symmetry.✓ Correct
C.A circle has no line of symmetry.
D.An angle has two lines of symmetry.
Explanation
A regular polygon of n sides has exactly n lines of symmetry. So a regular decagon (10 sides) has 10 lines of symmetry. A regular hexagon has 6 lines of symmetry (not 4). A circle has infinite lines of symmetry. An angle has only one line of symmetry (its bisector).
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