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Yes, the arrowhead shape is symmetrical along it's longitudinal axis (long side).
linear
A circle.
You cannot measure it exactly, but there is a little-known method of approximating it. You need to measure a distance of 3 inches from the vertex along each ray. Twenty times the length of the segment connecting these points is approximately the measure of the angle between the rays.
The definition is any chart where one or more points lie off the straight line joining the other points.