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Chapter 4 Basic Geometrical Ideas Ex 4.3 Solutions

Question - 1 : - Name the angles in the given figure.

Answer - 1 : - ∠BAD, ∠ADC, ∠DCB, ∠CBA

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

Answer - 2 : -

(a) A
(b) C, A, D
(c) B, E, O, F

Question - 3 : -
Draw rough diagrams of two angles such that they have
(a) One point in common.
(b) Two points in common.
(c) Three points in common.
(d) Four points in common.
(e) One ray in common.

Answer - 3 : - (a)

∠COD and ∠AOB have point O in common.

(b)
 
∠AOB and ∠BOC have points O and B in common.
(c)
 
∠AOB and ∠BOC have points O, E, B in common.
(d)
 
∠BOA and ∠COA have points O, E, D, A in common.
(e)
 
Ray   is common between ∠BOC and ∠AOC.

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