
Exact Angles
The Measure Between command lets you measure
exact angles between the following geometrical entities that have (at
least) one common point.
Important

Angle calculation between two curves or between one curve
and one line can only be performed in exact mode. In the same way,
selecting the intersection points between two curves or between one line
and one curve is possible only in exact mode.

Note that even if the exact mode is selected, the
tolerance for angle calculation is 10^{e4} rad (tolerance
value: 0.005 deg)
Angle measurement between a plane and a curve
In exact mode, angle calculation between a plane and a curve (the curve
intersects the plane) result is the angle between the direction of the
plane (displayed in red) and the tangent of the curve at the intersection
point (displayed in blue).
Angle measurement between two curves (or between a line and a curve)
Two lines (even if
not in the same plane): 
A line and a curve: 


Two curves: 


Notes:

In the above three cases, if entities intersect more
than once, the measure is made at the point of intersection nearest
the point at which selection 1 is made.

The angle measurement between
a curve and a plane or between a curve and
a line (even if we select them using the infinite mode) is
performed only if the curve intersects the plane or the line.
Example below:
The spline intersects the plane 1, in this case: the
angle is measured.
The spline does not intersect the plane 2, in this case
only the distance is measured.


A curve and a surface: 

Note:
If the curve and surface intersect more than once, the measure is
made at the point of intersection nearest the point of the selection on
the curve. 


A line and a surface: 
A line and a plane: 


Two surfaces: You
can also measure the angle between two surfaces provided both surfaces
are planar. 
Complementary Angles
You can obtain the complementary angle (360°
 the initial angle measured) when measuring between two curves: drag the
angle line to show the complementary angle.

Note: The dialog box and knowledge
parameters are refreshed. The value of the complementary angle is
stored along with the measure. 
For any two geometrical entities that meet, the choice of
measurement between a given angle or its complementary angle is performed
with respect to where you select the entities in the 3D area:
Notes:

If you select entities in the specification tree, the
measured angle is given arbitrarily (A or 180 degrees  A)

The orientation of the curves or lines is not taken into
account
