00:05
We have this triangle and the three sides are x, y, and r.
00:16
So now we know that the angle a measures 55 degree and the r, okay, the hypotenuse r is 11.
00:30
Now we want to find the length of the side x and the length of the side y.
00:38
So we know that the sine function of the angle a equals opposite over hyperbole.
00:49
So y over r which is sign of 55 degree okay so sign of 55 degree is 0 .819 so we can find the length of the side y so y equals r times sign of 55 degree so i have 11 times 0 .819 which is around 9 .53 we also know that cosine of the angle a equals adjacent over hypotenuse, okay? so which is cosine of 55 degree.
02:11
So cosine of 55 degree is around 0 .574, okay? so now we can find the lens of side x, which is r times cosine of 55 degree, which is 11 times 0 .574, which is around 6 .6 .314.
03:02
Okay.
03:15
So in the first answer box, you filled with, you filled with the number...