only for math genius.. full explanation is needed I'll mark the correct explanation as brainliest.. for your convenience answer is 15.let's see who is genius here.. un-neccesary ones will be reported..
Answers & Comments
Mocka
Consider the diagonal as AB. it interests the 3 unit line at D . let the angle between AB and 9 unit line is C . then AB= 9secC + 12secC 9secC×sinC + 12secC×sinC = 3 or tanC = 1/7 .
Answers & Comments
let the angle between AB and 9 unit line is C .
then AB= 9secC + 12secC
9secC×sinC + 12secC×sinC = 3 or
tanC = 1/7 .
So AB = (9+12)secC .
so comparing we get x = 15 .