Video Transcript
In the figure, the sides ππ
and π΅πΆ are parallel. If π΄π equals 18, ππ΅ equals
24, and π΄π equals 27, what is the length of ππΆ?
Weβre given the side lengths
π΄π, ππ΅, and π΄π. And we want to find the length
of ππΆ. Weβre also told that the sides
ππ and π΅πΆ are parallel. Now, the side splitter theorem
tells us that if a line parallel to one side of a triangle intersects the other
two sides, then that line divides those two sides proportionally. In particular, in our case this
means that π΄π is to ππΆ as π΄π is to ππ΅. Now, if we substitute our known
lengths into this equation, π΄π is 27, π΄π is 18, and ππ΅ is 24, we have 27
over ππΆ is equal to 18 over 24. We can rearrange this to get
ππΆ equal to 24 over 18 times 27, which evaluates to 36.
And so using the side splitter
theorem, we find that the length of ππΆ is 36 units.