Question

AD/AB=AB/AC. If AD=9 cm and DC=4 cm, then AB= ___ and BC= ___. Anybody know the answer?

Answer 1

find AC
\[9^2+4^2=97\]
\[\sqrt{97}=9.8\]
9.8*9=88.2
88.2=AB*AB
\[AB=\sqrt{88.2}=9.4\]
\[\sqrt{9.8^2+9.4^2}=BC\]
=2.8