00:01
So in this question, they say that a kite is flying on the end of a 19 meter string, which makes an angle of 38 degrees to the horizontal.
00:09
I want to know what is the kite's height above the ground.
00:13
We're assuming that the string is taught, and it's held one meter above the ground, and that the ground is horizontal.
00:23
So let's make a picture here.
00:26
We have a kite that's at the end of a 19 meter string.
00:33
So this guy here is 19 meters, and it makes an angle of 38 degrees to the horizontal.
00:46
Now, i want to know what is the kite's height above the ground.
00:53
So i'm going to need to figure out this distance, x.
00:57
But that's not quite my final answer, because the kite is held one meter above the ground.
01:06
So this distance here is one.
01:09
So we're going to use that shortly, but we're going to find x first.
01:14
To do so, i'm going to use trigonometry.
01:18
I am trying to relate the side opposite, the 38 degree angle, and the hypotenuse.
01:26
To do that, i can use the sign of the angle.
01:30
I can say that the sign of my 38 degree angle is equal to x over 19, which means that my x itself is 19 times the sign of 38 degrees...