In a triangle ABC, the angle at B is 108 degrees, the length of side BC is 16, and the length of side AB is 12. To 2 decimal places, what is the length of side AC?
So i worked out and out and got this answer 22.77 is that right? I used cosine rule.
In a triangle ABC, the angle at B is 108 degrees, the length of side BC is 16, and the length of side AB is 12. To 2 decimal places, what is the length of side AC?
So i worked out and out and got this answer 22.77 is that right? I used cosine rule.
Using cosine rule, $AC^2=16^2+12^2-2(16)(12)\cos 108^\circ$, so you are right.