Based on this diagram, I am confused as to why for letter d, the Q2 = 4x10^-6 charge has the distance using the pythagorian thereom. sqrt ( 2m)^2 + (2m)^2 Shouldn't it be 2m? Thank you in advance for your help!

\f(1/2) d) Looking at the figure above, calculate the electric potential energy of charge O3 in the presence of charges O1 and O2, Same configuration given in the picture above. U3 = Q3 V 1 &2 = 23 ( V1 + V2) k (-3 x 10-6C) k (+4x 10-6C) U3 = (+5 x 10-C) x + = - 3.860mJ 2m V(2m)2 + (2m)