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R(r1+r2) = r1r2, For r2
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R(r1+r2) = r1r2, For r2

User Wolfcastle
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R(r_1+r_2)=r_1r_2\\ Rr_1+Rr_2=r_1r_2\\ Rr_2-r_1r_2=-Rr_1\\ r_2(R-r_1)=-Rr_1\\ r_2=-(Rr_1)/(R-r_1)
User Jjm
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