Math question help!

So we've just started with working with Vectors and I have a paper to finish for tomorrow, but I simply can't remember that fucking cosinus/sinus stuff.

image: unavngivetk

Find the coordinates for B & C.

How do I do that? :)

Please help me out lads.
Comments
24
Well B is [8, 0] at least
B is easy ofc but C is kinda fucked up
Parent
use your books and pay attention in the lesson
Im on holidays fuuuuu
Im having weekend fuuuuu
make a new triangle, going stright up till the high of c then to the right
the lower angle is 30°, the upper one 90

then you can calculate:
sin30*5= x value of c
cos30*5= y value of c

-> y value of c= sq root (5²-x²)

-> coordinates of c
(2.5;4.3301)

image: trianglez
You're amazing!
Parent
wrong tbh
is it? Didnt really think about :P Just a quick answer.
Parent
Im on holidays fuuuuu
Erm, you don't know trigonometry? :-/
You can say that math aint my cup of tee.
Parent
Fair enough, at least you're honest about it.
Parent
age 20 and this is your math? olol
I've studied Social Studies & History :-)
Parent
nice!

what can you do now, which job i mean
Parent
Playschool teacher?
Parent
C = [2.5 | 13/3]
you live in germany? instant vacation atm lolz!
sin(alpha)/ a = sin (beta)/b =sin(gamma) /c
lol i don't see you getting very far when you get to stuff like hyperbolic functions
Drop a perpendicular bisector from C to AB.
The x-coordinate of C is 5*cos(60) and the y-coordinate of C is 5*sin(60)

Comes out to (5/2, 5/2 * sqrt(3) )
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