00:01
All right, we have this building.
00:05
And on this building, we have the flagpole.
00:08
And we know the flagpole is 94 .9 feet tall.
00:13
We know that we have an angle of elevation to the top of the flagpole.
00:18
That is 34 .2 degrees.
00:22
And an angle of elevation to the bottom of the flagpole.
00:25
Better than that.
00:27
At 25 .1 degrees.
00:30
We want to know what the height of the building is.
00:35
I'm going to call that, i'm going to call it x.
00:48
Okay.
00:49
Now, using right triangle trigid ratio, sine, cosine, tangent, we've got right triangles here, and we can relate the two right triangles with, we have information that is opposite the angles, and then they have the adjacent side in common, even though we don't know what it is.
01:18
So we're going to go tangent, opposite and adjacent.
01:23
So if i read a couple ratios here, we could say that the tangent of 34 .2 degrees is equal to the opposite of the 34 .2 degrees would be x plus 94 .9.
01:41
That's opposite over the adjacent.
01:43
I'm just going to call it a for adjacent right now.
01:48
And then also the tangent of 25 .1 degrees would be equal to opposite over adjacent.
01:55
It's the same adjacent...