Suppose that the earth is a sphere of radius 6400 kilometers. The height from the earth's surface from where exactly a fourth of the earth's surface is visible, is

Step-by-step solution

AP = R area of ring =(2 Rsin ) Rd Total area required, R ²= ₀^ 2 R² d array l 1 2 =1- = 1 2 array Now, array l = R R+H 1 2 = R R+H =R=H=6400 array