Using protractor, draw a right angle. Bisect it to get an angle of measure `45^0dot`

Use a protractor to draw an acute angle, a right angle and an obtuse angle :

Fill in the blanks with acute, obtuse, right or straight : (a) An angle whose measure is less than that of a right angle is______. (b) An angle whose measure is greater than that of a right angle is ______. (c) An angle whose measure is the sum of the measures of two right angles is _____. (d) When the sum of the measures of two angles is that of a right angle, then each one of them is ______. (e) When the sum of the measures of two angles is that of a straight angle and if one of them is acute then the other should be _______.

In the experiment on tracing the path of a ray of light passing through a rectangular glass slab, the correct setting of the protractor (D), for measuring the angle of incidence ( angle I ), and the angle of emergence ( angle e ) correspond, respectively, to diagrams :

Construct with ruler and compasses, angle of measure: 45 ^(@)

Draw two acute angles and one obtuse angle without using a protractor. Estimate the measures of the angles. Measure them with the help of a protractor and see how much accurate is your estimate.