https://binary2hex.com/square-area.html?id=4

Square area with diagonal 999999999999999 equal to 5.0E+29

Square area calculation method
Diagonal d:

Square

A square is a regular quadrilateral with all angles equal and all sides equal. Moreover, all the angles of the square are equal to 90°.
Square area formula Diagonal square area formula where d is the diagonal of the square.

Solution:
S =
1
2
d2
=
1
2
9999999999999992
=
5.0E+29

Answer: the area of a square with a diagonal 999999999999999 equal to 5.0E+29