Question

every time he clicks a button the figure rotates 90 degrees clockwise how many times does he need to click the button so that each figure returns to its original orientation

Answer 1

I believe 4 because it has to do a 360 degrees turn to be facing in the same position , 4 x 90 = 360

Answer 2

90 degreees is right angle
1 full rotation=360
360/90=4
4 times

ok, so long way
start at 0 degrees
*push*
90 degrees
*push*
180 degrees
*push*
270 degrees
*push*
360 degrees, same as start

4 times