Literally Too Many Variables!

Algebra Level 2

$\large \dfrac{p^2}{a^2}+\dfrac{q^2}{b^2}+\dfrac{r^2}{c^2}$

If $\dfrac{p}{a}+\dfrac{q}{b}+\dfrac{r}{c}=1$ and $\dfrac{a}{p}+\dfrac{b}{q}+\dfrac{c}{r}=0$ , then compute the expression above.