### Theory:

Angle:
When two lines meet, they always meet at a certain angle. An angle is specified using a number followed by a $$(^\circ)$$ symbol like $$15^\circ$$, $$120^\circ$$, $$180^\circ$$, and so on.
Example:

In the figure given above, $$\overline{CD}$$ meets $$\overline{CB}$$ at $$90^\circ$$
An angle can be constructed by using a protractor.

Let us see how to construct a an using a protractor.

Step 1: Draw a line segment $$PA$$.

Step 2: Place the protractor on the line segment $$PA$$ by taking the midpoint of the protractor at point $$P$$, as shown in the figure.

Step 3: On $$PA$$ from the right, start counting from $$0°$$ in the ascending order (counter-clockwise direction and finally mark a point $$Q$$ using a sharp pencil at the point showing $$60°$$ on the semi-circular edge of the protractor.

Step 4: Remove the protractor and join $$PQ$$.

We get the required angle, $$∠APQ =$$ $$60°$$.