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Question
Make R2 the subject of formula R2 = 4π(R12 - R22)
Solution
R2 = 4π(R12 - R22)
⇒ R2 = 4πR12 - 4πR22
⇒ 4πR22 = 4πR12 - R2
⇒ R22 = `(4pi"R"_1^2 - "R"^2)/(4pi)`
⇒ R2 = `sqrt((4pi"R"_1^2 - "R"^2)/(4pi)`.
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