Exercise 4.3

Name the angles in the given figure.

(i) ∠ (or) ∠DAB

(ii) ∠ (or) ∠CBA

(iii) ∠ (or) ∠DCB

(iv) ∠ (or) ∠ADC

In the given diagram, name the point(s)

(a) In the interior of ∠DOE : is the point in the interior ∠DOE.

(b) In the exterior of ∠EOF : is the point in the exterior ∠EOF.

(c) On ∠EOF : is the point on ∠EOF.

Draw rough diagrams of two angles

(a) one point in common.

Example : O is the common point of ∠AOB and ∠COB.

(b) two points in common.

Example : O and P are the common points in ∠SOA and ∠OPQ.

(c) three points in common is not possiblepossible.

(d) four points in common is not possiblepossible.

(e) One ray in common.

Example: OB is the common ray of ∠AOB and ∠DOB.