Measure and classify each angle:

Angle	Measure	Type
∠AOB
∠AOC
∠BOC
∠DOC
∠DOA
∠DOB

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

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?

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.

Let be the perpendicular to the line segment. Let and intersect in the point A. What is the measure of ∠PAY?