Incorrect ARC from importing a EPS file

Hello,

I am creating manually a small EPS file

%!PS-Adobe-3.0 EPSF-3.0
%%BoundingBox: 0 0 500 500
72 25.4 div dup scale
0 setgray
0.01 setlinewidth
0 0 300 0 90 arc
stroke

while I am using a angle of 90 degree all works fine, but if I am using a angle of e.g. 60 degree

the line is no correctly displayed

Here is a EPS test file with 60 degree angle

%!PS-Adobe-3.0 EPSF-3.0
%%BoundingBox: 0 0 500 500
72 25.4 div dup scale
0 setgray
0.01 setlinewidth
0 0 300 0 60 arc
stroke

The output in Corel X4 is the following different lines