Basic Geometrical Ideas Ex 4.3

Chapter 4 Basic Geometrical Ideas Ex 4.3

Question 1.
Name the angles in the given figure.

Solution:
The angles are:
(i) ∠A or ∠DAB
(ii) ∠B or ∠CBA
(iii) ∠C or ∠DCB
(iv) ∠D or ∠ADC.

Question 2.
In the given diagram, name the point(s):

(a) In the interior of ∠DOE
(b) In the exterior of ∠EOF
(c) On ∠EOF
Solution:
(a) A is the point in the interior ∠DOE.
(b) C is the point in the exterior ∠EOF.
(c) B is the point on ∠EOF.

Question 3.
Draw rough diagrams of two angles such that they have
(а) one point in common.
(b) two points in common.
(c) three points in common.
(d) four points in common.
(e) One ray in common.
Solution:
(a) In figure (a), O is the common point of ∠AOB and ∠COB.

(b) In figure (b), O and P are the common points in ∠SOA and ∠OPQ.

(c) Such a diagram is not possible.
(d) Such a diagram is not possible.