solve triangle BCD. I don't understand how to solve this problem seeing how only one side is labeled. Please help!

Question

anonymous · Answer

attachment

rishavraj · Answer

whts m<D ???

anonymous · Answer

I dont know yet I have to figure that out too :/

rishavraj · Answer

see sum of all angles of a triangle = 180
u got values of two angles...so find the value of third angle

anonymous · Answer

oooh okay so D is 69 degrees

rishavraj · Answer

yup...... :))and lol only  two options mention tht value.. :P

anonymous · Answer

A and C, hmm but I need to find sides BC and CD

rishavraj · Answer

remember sin x = opposite/hypotenuse

anonymous · Answer

Would I plug 69 into sin?

rishavraj · Answer

as u wish.....like u can also do
cos(21) = BC/18

anonymous · Answer

my calculator said there was an error :o I don't know what BC is so I plugged in x over 18

rishavraj · Answer

18 cos(21) = BC
cos(21) = 0.9335.................

rishavraj · Answer

creepy value -_-

anonymous · Answer

thank you! and i know right?? haha