Open Question: What is the formula to find center coordinates of a square?

let's say the vertex is A(0, 0)
and the length of side is 4

other points would be
B(4, 0)
C(4, 4)
D(0, 4)

the diagnonals are
BD: (4, 0) (0, 4)
and
AC: (0, 0) (4, 4)

midpoint of BD (E)

xE = (4 + 0) / 2
xE = 2

yE = (0 + 4) / 2
yE = 2

E(2, 2)

Midpoint of AC (E)
also equals
E(2, 2)

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