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Q.

If an angle of measure 80 °   is reflected through a line of symmetry, then what will be the angle of measure of reflection (image)?


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a

0 °  

b

80 °  

c

180 °  

d

90 °    

answer is B.

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Detailed Solution

We have given an angle of measure 80 ° .  
We know that a line of symmetry could be a line that cuts a shape exactly in half.
This suggests that if you were to fold the shape along the line, both halves would match exactly equally, therefore if you were to position a mirror along the line, the shape would remain the same.
Therefore, if an angle of measure 80 °   is reflected through a line of symmetry (mirror), then the angle of measure of reflection will be of the same measure, i.e. 80 ° .  
Hence option (2) is correct.
 
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