Let A be the suface area of the zone on the sphere p : d
Chapter 13, Problem 45(choose chapter or problem)
Let A be the suface area of the zone on the sphere p : d between the planes: : :l and z : a2 (where -ds;l < ::5 a). Use the formula of l3.8to show that A : 2rralt-where lt : :l - at.
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