00:01
In this question, we've been told that there is a triangle and the sides of the triangle are 196 cm, then 149 and 94.
00:15
We'll call this 149 and 94 centimeter.
00:19
And we need to find out the angle opposite to these sides.
00:23
So in the first part, we need to find out the angle opposite to the side, which has a length of 94.
00:30
So we need to find out this angle.
00:33
This is opposite to the side which has the length 94 centimeter.
00:38
So we are going to find out this angle using law of cosine.
00:42
So the law of cosine is cosine.
00:45
We'll use this angle cost theta is going to be equal to a square plus b square minus c square divided by 2ab.
00:56
In this case, a is going to be this side and b is going to be.
01:01
Going to be this side.
01:02
So a and b are both the sides which form the angle and c is the side which is opposite to the angle.
01:13
So as you can see this is going to be a, this is going to be b and the side which is opposite is going to be c...