2.1.1311 Part 1 Section 20.1.9.11, gd (Shape Guide)

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a.   The standard uses incorrect terms and symbols to describe shape guide formula mod in the fmla attribute.

In Office, mod x y z equals sqrt(x^2 + y^2 + z^2).

b.   The standard defines sqrt x = sqrt(x) in the fmla attribute.

In Office, sqrt x = sqrt(abs(x)).

c.   The standard does not specify the unit of measurement implied when a trigonometric formula is used in the fmla attribute.

In PowerPoint when a trigonometric formula is specified in the fmla attribute, the angle is measured in 60000ths of a degree.

d.   The standard defines at2 x y = arctan(y/x) in the fmla attribute.

In PowerPoint at2 x y is treated as atan2(y,x) in the fmla attribute.  When y == 0 and x == 0, Powerpoint returns 0.