00:01
Okay, so we are discussing a right triangle since angle c is 90 degrees.
00:06
They told you angle b is 65 .2 degrees, and then side b is 128 inches.
00:17
So if we get a sketch of a right triangle in here, here's your right angle, so that is angle c.
00:26
So this is side c.
00:27
Let's let this be angle b, so this is side b, and this will be angle a, so this is side a.
00:35
So since this is a 90 degree angle, we know that angle c, sorry, angle a is 90 minus 65 .2, since the sum of all of the angles in a triangle will add to 180.
00:52
So angle a is 24 .8 degrees.
00:56
Now we can find side a or side c.
01:06
Let's say that sign of angle b is opposite, which is side b, over their hypotenuse, which is c.
01:18
Make sure your calculator is in degree mode, and so c is equal to b over sine of b.
01:26
Plugging in values 128 divided by sign of 65 .2 degrees and so side c is equal to 141 inches and then we can find side a you could do pythagorean serum we'll do pathagorean serum to check it but let's do sign of angle a is equal to opposite over hypotenuse...