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For the first question, triangle ABC is congruent to triangle DEF by the ASA (angle side angle)
For the second question, triangle MNO is congruent to triangle PRQ by the SAS (side angle side)
For the third question, triangle UVW is congruent to triangle XYZ by the SAS (side angle side)
On the complex plane, the number is mapped onto the point with coordinates .
In other words, the x coordinate is the real part of the number, while the y coordinate is the complex part of the number.
Viceversa, if you start from a point , you can identify the number .
So, the endpoints of the diagonal are the points and . These are points A and C in the attached figure.
This means that points B and D have coordinates
So, the correspondant complex numbers are