00:01
In this program, we are giving that a six feet or foot tall man walks away from a light post.
00:09
So imagine that this is a light post.
00:13
Somewhere over there is a light.
00:15
And the person is somewhere over here and is walking away from the light source or the post.
00:26
And say, by just drawing a straight line starting at the light source, down to the person's head all the way to the ground.
00:36
We can see that the shadow of the person, so let's just mark this with green, that the shadow of the person would be somewhere over here on the ground, and this will be the length of the shadow.
00:48
So let's call this length y.
00:51
Let's call the distance from the man to the pole, x, and his distance is six.
00:59
Just mark this with six feet.
01:02
And we know that the so the street light is 12 feet from the ground.
01:09
So this is not 12.
01:09
With all of this information, we can pretty much just ignore everything and get two similar triangles.
01:16
So we are supposed to get two similar triangles in that picture.
01:21
We put something like this.
01:22
So 6, 12, x and y.
01:25
So using similar triangles we get, so you see similar triangles, we get the following proportion.
01:37
That 6 divided by y is equal to 12 divided by the sum of x and y...