I have started to go over missing angles using the cosine rule.
So i have an set up of B = 6.6cm C=4.0cm now i need to find the missing lenght of A and the A angle is 70 degrees.
so i do this to work it out A2= 10.89 + 16.0
the cosine of 70 degrees is = 0.3420
and this... 2x 6.6 x 4.0 x cos(70) gives me the answer 18.0586
but if i do it this 2x 6.6 x 4.0 x 0.3420 gives me the answer 11286 over 625
something does not add up.
So i have an set up of B = 6.6cm C=4.0cm now i need to find the missing lenght of A and the A angle is 70 degrees.
so i do this to work it out A2= 10.89 + 16.0
the cosine of 70 degrees is = 0.3420
and this... 2x 6.6 x 4.0 x cos(70) gives me the answer 18.0586
but if i do it this 2x 6.6 x 4.0 x 0.3420 gives me the answer 11286 over 625
something does not add up.