Investigate:

In the given figure, the angle measures 30°. Look at the same figure through a magnifying glass.

Does the angle become larger? Does the size of the angle change?

Find the measure of the angle shown in each figure. (First estimate with your eyes and then find the actual measure with a protractor.).

Find the angle measure between the hands of the clock in each figure:

Measure and classify each angle:

Which of the following are models for perpendicular lines-

(a) The adjacent edges of a table top.

(b) The lines of a railway track.

(c) The line segments forming the letter ‘L’.

(d) The letter V.