00:01
All right, this one, they want you to find a little a.
00:03
Okay, so you first need to find angle c.
00:13
Angle c equals 180 minus the sum of 60 plus 75.
00:20
So that's 180 minus 135, which equals 45 degrees.
00:32
You can use the law of signs.
00:38
So you can say the angle or the side.
00:43
So a over the sign of 60 equals c, which is square root of 2 over sign of 45.
00:59
Now knowing what the sign of 45 degrees is, sign of 60, go back to your special right triangle.
01:12
30, 60, 90.
01:15
So this would be 1, square root of 2.
01:24
So the sign of 60 would be, it would be 60 equals the square order to 2 over 3.
01:44
Now, i have that backwards...