I dont know yet I have to figure that out too :/
see sum of all angles of a triangle = 180 u got values of two angles...so find the value of third angle
oooh okay so D is 69 degrees
yup...... :))and lol only two options mention tht value.. :P
A and C, hmm but I need to find sides BC and CD
remember sin x = opposite/hypotenuse
Would I plug 69 into sin?
as u wish.....like u can also do cos(21) = BC/18
my calculator said there was an error :o I don't know what BC is so I plugged in x over 18
18 cos(21) = BC cos(21) = 0.9335.................
creepy value -_-
thank you! and i know right?? haha