In Fig. 4.138, . Find the length of XY.
We have , XY||BC
In Δ AXY and ΔABC
<A = <A (Common)
<AXY = <ABC (Corresponding angles)
Then, Δ AXY ~ΔABC (By AA Similarity)
So, (Corresponding parts of similar triangle area proportion)
Or
Or XY = 6/4
Or XY = 1.5cm