Question

How do you draw a 90° angle?

• A. By drawing a perpendicular to a line from a point lying on it.
• B. By bisecting a 120° angle.
• C. By bisecting a 60° angle.
• D. By drawing multiples of a 45° angle.

Answer 1

The correct option is A By drawing a perpendicular to a line from a point lying on it.

Step 1: Given a point P on a line l

Step 2: With P as the centre and a convenient radius, construct an arc intersecting the line l at two points A and B.


Step 3: With A and B as centres and a radius greater than AP, construct two arcs, which cut each other at Q.



Step 4: Join P & Q. PQ is perpendicular to l.