Plz help meee! Math makes my brain hurt!!

Ineed to know the answer to this algebra question.

If chord ab is congruent to chord cd, then what must be true about ef and eg?

The ivring berlin learning center would like a possible net profit of $650,000 on its new resource manual it sells to schools. the fixed costs for producing the manual are $780,000 and the variable cost per package is $19.85. if the estimated unit sales are 1,250,000 units, what selling price unit should the ivring berlin learning center try?