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## 'Little and Large' printed from http://nrich.maths.org/

The point $X$ moves around inside a rectangle of dimension $p$
units by $q$ units. The distances of $X$ from the vertices of the
rectangle are $a$, $b$, $c$ and $d$ units. What are the least and
the greatest values of

$a^2 + b^2 + c^2 + d^2$

and where is the point $X$ when these values occur?