well it isnt that difficult o.o" books aren't perfect xD
C^2 = A^2 + B^2 - 2AB Cos(c)
C^2 = 8^2 + 10^2 - 2(8)(10) Cos (56.2)
C = 8.65983265
Hi guys,
I have a question on the cosine rule that i think i am getting right but the books answers tell me that its wrong. Its really easy:
In triangle ABC, a=8cm, b=10cm, C(Angle)=56.2 degrees. Find c(missing side).
Thanks in advance (im sure im right)
Steve
i think you got the triangle wrong o.o"
you got the 100 and 64 correctly but your last term i don't understand how you get it
try :
Cosine Rule
If you are using a calculator calculate the value for cos 56.2 (in degree) first before you multiply it with 2, 8 and 10
well if you still don't get
cos 56.2 = 0.556295615
then it is time you change a new calculator o.o" i tried on two of mine and they obtained the same value