Prove that 1-r1-1-r2-1-r3-1-r

We know r_1=Δs a, r_2 =Δs b, r_3 = Δs c, r = Δs ∴1r_1+1r_2+1r_3 =3s a b cΔ =3s 2sΔ =sΔ=1r ...

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Applications of Cross Product

Prove that ...

Question

Prove that $\frac{1}{r_{1}} + \frac{1}{r_{2}} + \frac{1}{r_{3}} = \frac{1}{r}$

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