Question

How to draw an angle of 90 degree?

Answer 1

Draw a line segment AB. Set the compass of length more than the half of AB. Put the compass on point A and cut an arc. Then put the compass at B and cut another arc imtersectecting the previous one. Mark the intersection point as C. Through C, draw a line which intersects AB at D. Then the angles CDA and CBD will be 90 degree.

Answer 2

by cutting the arc between 60degree and 120degree then the 90degree formed.