Quenzo wrote

Hi Dxli

For item 1
steps:
a I draw a circle
b Draw an ellipse intersecting the circle
c Main menu -> Move / Copy
d I make four copies Figs. A, B, C, D and E)
d sign with arrows the exact points where I will select each figure.
e Main menu -> Modify -> Trim / Extend two

In the fig A
First entity to cut: ellipse
Second entity to cut: circle

In the fig B
First entity to cut: ellipse
Second entity to cut: circle

In the fig C
First entity to cut: circle
Second entity to cut: ellipse

In the fig D
First entity to cut: circle
Second entity to cut: ellipse

In the fig E
First entity to cut: ellipse
Second entity to cut: circle

I don't understand why the final results are differents
Trim_two.dxf



For item 2
I did the tests with the option Main Menu -> Modify -> Trim / Extend two, I didn't with the option Main Menu -> Modify -> Divide

steps:
a I draw a circle
b Draw a freehand line intersecting the circle
c Main menu -> Modify -> Trim / Extend two
d First entity to cut: freehand line
e Second entity to cut: circle
f The application closes
(Repeated several times)



For circle tangential and two points
a I draw a square
b Enable snap to middle only
c Main Menu -> circle
d Drawing a circle of radius 10 at the midpoint of the right edge on the square
e Enable snap on endpoints
f Main Menu -> circle -> circle tangential 2 points
g When it asks "Specify the line/arc/circle", I select the circle above
h When it asks "Specify the first point on the circle tangent", I select the lower left corner on the square
i When it asks "Specify the second point on the circle tangent", I select the upper left corner on the square

Result:
Tangential_2points.dxf

Best regards

Manel