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in Circles by (27.0k points)
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In Fig. O is the centre of the circle and ∠BDC = 42°. 

The measure of ∠ACB is 

A. 42° 

B. 48° 

C. 58° 

D. 52°

1 Answer

+1 vote
by (27.4k points)
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Best answer

Option : (B)

∠BDC = 42° 

∠ABC = 90° 

(Angle in a semi-circle) 

In ABC, 

∠ABC + ∠BAC = 42° 

(Angles on the same segment) 

90o + 42° + ∠ACB = 180° 

∠ACB = 48°

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