Hi, I have a problem that is giving me trouble solving. The problem reads The vertices of a $\displaystyle \triangle$ ABC are at the points A$\displaystyle (a, 0)$, B$\displaystyle (0, b)$, C$\displaystyle (c, d)$. If $\displaystyle \angle$B =$\displaystyle 90 degrees$. find a relaionship between a, b, c and d. The book answere is $\displaystyle b(d-b)=ac$. Can someone help me to fugure out this proble please thank you.