In our recent article,1 we have noticed a typographical error in the equations appearing in Appendix A, where an extra Δ appears in front of xdx/dθ and ydy/dθ in the first three equations. The correct versions of the equations without the extra Δ are as follows:

xθ+Δθxθ+Δθ·xθ+Δθ2,

where evaluating xθ+Δθ/2 requires approximating xθ+Δθ/2 and yθ+Δθ/2,

xθ+Δθ2xθ+Δθ2·xθ,
yθ+Δθ2yθ+Δθ2·yθ.
1.
F.
Behroozi
and
P. S.
Behroozi
, “
Reliable determination of contact angle from the height and volume of sessile drops
,”
Am. J. Phys.
87
(
1
),
28
32
(
2019
).