It is a perfect 90°, which is often shown by a small square ... Place the middle of the base line exactly at the point of the angle. Make sure that one of the angle lines goes through the zero.

An obtuse angle is between \(90^\circ\) and \(180^\circ ... Ensure that the centre of your protractor is over the point Q. Make a mark at \(60^\circ\). Remove the protractor and join Q to ...