00:01
We are given two angles and a side.
00:05
We want to find another angle and the two sides missing.
00:10
So to get another angle, we know that the interior angles of a triangle is under 80 degrees.
00:17
Therefore, to find angle a, which is outstanding, we just subtract from 1 .80, the given angles.
00:32
And we will find out that a is a...
00:36
80 degrees.
00:43
Then to get the remaining sides we use the sign rule.
00:50
So the next side which is missing is b.
00:54
So we divide by sign b using the law of sign equal to a which is 15 divided by sign a which is 10 divided by sign a which is so, 8.
01:15
Therefore, b is equal to 15 times sine b and b is 35.
01:23
So, sine 35 divided by sine 80...