Prove that the portion of a sphere of radius R seen by an observer located at a
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Prove that the portion of a sphere of radius R seen by an observer located at a distance d above the North Pole has area A = 2πdR2/(d + R). According to Exercise 52, the cap has surface area 2πRh. Show that h = dR/(d + R) by applying the Pythagorean Theorem to the three right triangles in Figure 22.
Data From Exercise 52
Show that a spherical cap of height h and radius R (Figure 19) has surface area 2πRh.
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h Observer R
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