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Question

A straight angle i.e 180o is symmetric about its

A
initial arm
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B
terminal arm
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C
vertex
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D
angle bisector
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Solution

The correct options are
A vertex
D angle bisector
For a straight angle i.e. a line, the line of symmetry is its angle bisector or perpendicular bisector.
This angle is also symmetric about its vertex.
Hence, both options C and D are correct.

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