What is the length of side BC??? @cj49 (Round the correct answer to one decimal place). @nikato @OOOPS

Question

anonymous · Answer

attachment

anonymous · Answer

Help me out please

imstuck · Answer

You can use either the 40 degree angle or the 30 degree angle.  You have those angles and you also have some lengths of the bases.  Which do you prefer?  You wiill get the same answer no matter which one you pick.  40 or 30?

anonymous · Answer

the 40 angle @IMStuck

xapproachesinfinity · Answer

you can use tang here $\Large \sf\color{blueviolet}{tan40=\frac{x}{20}}$

xapproachesinfinity · Answer

yeah you can use either of two angles

imstuck · Answer

OK THEN let's use 40.  Like this:

imstuck · Answer

|dw:1407983155028:dw|

imstuck · Answer

Which trig identity relates the angle to the adjacent side and the side opposite it?