00:03
The best way to tackle a problem like this where we're trying to find the height and we're given a similar object is to write a proportion.
00:11
So right now, we know that these are proportional because they have the same sun and they're in the same place.
00:20
And so we know that the height, so we'll do the height of the object over the shadow.
00:27
And so we know for the pine tree, the height is unknown, but the shadow is 20.
00:32
And for this little sapling, we know the height is 36 inches and the length is 24.
00:46
The shadow is 24 inches.
00:50
Now notice we have two different measurements here.
00:52
We have inches and we have feet.
00:55
So let's go ahead and convert the saplings into feet.
00:59
So this is equal to three feet over two feet.
01:06
Now we're working with this proportion, x over 20 is equal to 3 over 2...