NCERT Solution Class 6th Maths Chapter – 4 Basic Geometrical Ideas Exercise – 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) O is common point between ∠COD and ∠AOB

(b) O and B are common points between ∠AOB and ∠BOC

(c) O, E and B are common points between ∠AOB and ∠BOC

(d) O, E, D and A are common points between ∠BOA and ∠COA

(e) OC is common ray between ∠BOC and ∠AOC