When a mirror placed at a line AB then shows the exact mirror image of the given image?

A piece of paper is folded and as shown below. Find out from the answer figures how it will appear when opened.

Which answer figure is the exact mirror image of the given question figure.

In this figure, find the number of triangles.

In the following question select the figure from a set of answer figure that can be formed joining the figures given in question figure.

How many triangles are there in the figure?

Which answer figure is the exact mirror image of the given question

Select the answer figure in which the questions figure is embedded.