Question

In the given figures, the mirror (i.e., the line of symmetry) is given as a dotted line. Complete each figure performing reflection in the dotted (mirror) line. (You might perhaps place a mirror along the dotted line and look into the mirror for the image). Are you able to recall the name of the figure you complete?

Answer 1

Hint: Consider the curve given in the question as an object and take the reflection of this curve in the dotted (mirror) line. The reflection of the curve in the dotted (mirror) line will complete this half figure given in the question and after completion of the figure, see which figure we have got

Complete step-by-step answer:
In the below figure, a dotted line is shown along with a figure CABD is also shown.

   We are asked to complete this figure. This figure will be completed when we take the reflection of the curve AB given in the question in the dotted (mirror) line.
In the figure above, the dotted line is treated as a mirror and the curve AB is treated as an object. Now, we are taking the reflection of this object curve AB in the dotted (mirror) line.

In the above figure, the curve on the right side of the dotted line is the reflection of the curve present on the left side of the dotted line. It is clearly visible from the drawing that the complete figure after reflection is a circle.
Hence, the figure that we have completed is a circle.
Note: There could not be any other figure possible because if we reflect the curve which lies on the right side of the dotted line, we will get the same curve as present on the left side.