00:01
All right, so you posted that you need to solve the right triangle, but you can't copy the figure.
00:07
So here i have two figures with different information in them.
00:14
They're both right triangles.
00:16
And in this first figure, since we know that this angle is 20 degrees, that angle has to be 70 degrees.
00:27
Because it's a right triangle, and this is 90.
00:30
And 90 and 20 is 110, and you have to have 180 for a triangle.
00:35
So now you have to use a trig ratio to come up with the one of the sides.
00:43
It doesn't matter which one you use or which side you're going to find.
00:47
So let's say we'll call this x and this one y.
00:52
So if you're going to find x, you can use either one of the angles and we know that this is four.
00:59
So you could say use the 20 degree angle and then you'd have four and x and that's opposite and adjacent, so that would say tangent of 20 degrees is equal to 4 over x.
01:15
Or you could use the 70 degree angle and say tangent of 70 is equal to x over 4.
01:27
Either way, you'd solve for x.
01:29
In this one here, you'd first multiply both sides by x, and then you would have x tan 20 equals 4.
01:39
And then you divide 4 by tangent of 20.
01:43
That requires more work.
01:45
So this one, you just have to multiply both sides by 4...