HE complements and of the parallelograms which are about the diagonal of a parallelogram are equal.
= {\displaystyle =} (pr. 34.)
and = {\displaystyle =} (pr. 34.)
∴ {\displaystyle \therefore } = {\displaystyle =} (ax. 3.)
Q. E. D.
HE complements 
and 
of the parallelograms which are about the diagonal of a parallelogram are equal.
