{}&=A_{ABUH}+A_{ACVH}\\&=A_{BLRQ}+A_{RCMQ}\\&=A_{BCLM}\end{aligned}}} HowardEves. Pappus's Extension of the Pythagorean Theorem. The Mathematics Teacher
York: Springer Science+Business Media, 2003, ISBN 978-1-4020-1522-9 Eves, Howard Whitley, Great Moments in Mathematics (Before 1650), Mathematical Association