Question

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  

Answer 1

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