In Fig. 4.137, . Find the length of PB.
We have ΔPAB and ΔPQR
<P = <P (Common)
<PAB = <PQR (Corresponding angles)
Then, ΔPAB ~ ΔPQR (BY AA similarity)
So, (Corresponding parts of similar triangle area proportion)
Or ,
Or PB = x 6
Or PB= 2cm