Triangle ABC is inscribed in a circle such that A and B are the endpoints of a diameter. CD is the altitude drawn to AB. If AC=15 and BD=16, compute the value of (AD*BC/CD)-3

Question

Triangle ABC is inscribed in a circle such that A and B are the endpoints of a diameter.  CD is the altitude drawn to AB.  If AC=15 and BD=16, compute the value of    (AD*BC/CD)-3

Mgraph · Answer

C is the right angle => triangles ADC and CDB are similar. AD/AC=CD/BC =>(AD*BC/CD)=AC

Eric · Answer

if I follow your work then AC is 15 -3 Final answer 12