Question

If an angle of $60°$ is cut from a half folded square piece of paper, specify the cut out obtained when the paper is unfolded.

Answer 1

On unfolding, the $60°$ angle is reflected on the other half of the paper as well. Also when two angles meet end to end, they form a triangle. Since the folded crease is the line of symmetry, and the apex angle on the half is $30°$
Therefore, the overall figure is a triangle of angles 60$°$each, also called an equilateral triangle.