Question 302736
Triangle ABC is a right angle triangle as there is a 90degree angle. 

tan 50 degrees = {{{(BC)/(AB)}}} 

Therefore : AB = {{{7 / tan 50}}}
AB = 5.87 

sin 50 degrees = {{{ (BC)/(AC)}}}

Therefore: AC = {{{ 7 / sin 50 }}}
AC = 9.14