Question

锐角的三角比题目,5题,急 急 今晚一定要.

Answer 1

1、BD*AB=BC^2=144,

BD*(BD+25/13)=144,

13BD^2+25BD-144*13=0,

(13BD-144)(BD+13)=0,

BD=144/13,

CD=60/13,

sin