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Q.

If the tangents PA and PB  from an external point P  to a circle with centre O  are inclined to each other at an angle of 40° , then POA=

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a

80°

b

60°

c

70°

d

50°

answer is A.

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Detailed Solution

Question Image

 

In ΔPOA

∠PAO=90°

∠APO=1240=20°

∠POA=180−(90+20)

=180−110

=70° .

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