00:01
Okay, so here's my scenario.
00:04
If you're at this point, looking at the top of building, you are seeing it at 30 degrees for an angle of elevation.
00:10
If you move 100 feet closer, your new angle of elevation is 49 degrees.
00:16
Okay.
00:16
So i'm going to do this as two steps.
00:19
Also, i'm going to assume that's a right angle there.
00:22
I need to find the, i'm going to do, first i'm going to do is law of signs because i need to find the length of my hypoteness.
00:30
Of this triangle.
00:32
After that, i could just do regular trig.
00:34
So let's start when we find this angle here, which is 180 minus 49, giving me 131 degrees here.
00:42
Then that will help me find this angle because i could do 180 minus the 131, minus the 30 is going to give me 19 degrees here.
00:50
So if i call this length here x for my hypotenuse there, i'm going to first find x because x is going to across the 30, and then 19 is across the 100.
01:01
So i can find x.
01:02
By doing law of signs...