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the angular diameter of the sun is 1920'' . If the distance of the sun from the earth is 1.5 x 1011 m, then the liner diameter of the sun is  

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distance of sun from the earth =1.5 x 1011 m

angular diameter of sun ,

theta =1920''= (1920/60x60)o =1920/3600 xpi/ 180 rad

diameter of sun , D = s x theta 

                             = 1.5 x 1011 x 1920/3600 x pi /180 

                           D= 1.4 x 109 m

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