Van Aubel's theorem
Each square is connected, and the center is lined.
PR and SQ is vertical, and they are symmetry.
AB=2a, BC=2b, CD=2c, DA=2d, and they are complex numbers.
∴
You see the complex number, so A=0. Then, AP=p is z.
∴
You see Euler's formula.
π/2=90°
Then, you turn around squares.
SQ=A and PR=B
∴
Squares are curved.
2a+2b+2c+2d=0
∴
a+b+c+d=0
You see the complex number, so A=0. Then, AP=p is z.
∴
p=a+ia=(1+i)a
You see Euler's formula.
π/2=90°
Then, you turn around squares.
SQ=A and PR=B
B=iA
iB=i^2A
∴
A+iB=0
Squares are curved.









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