Why was the battle of el alamein significant?

It made the Germans surrender. Something they had not done all throughout the war.

A: The scale factor is 3.  I found this by taking the origin (the center of dilation) and finding the number of units until point P (3)  then found the number of units until point p' (9)  9/3=3 so it is a scale factor of 3.
B: P"(-1,-2) Q" (0,3) and R"(1,0)
C: PQR and P"Q"R" are not congruent.  Because PQR went through a dilation changing the side lengths, it is no longer the same triangle as P"Q"R".  It is merely similar.