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Radian
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Mathematics
Fields of mathematics
Geometry
History of geometry
Pi
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1970-01-01
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A
radian
is
a
unit of angular measurement used in
mathematics
and
engineering
. It is defined
as
the
angle
formed at the center of
a
circle
by an arc whose
length
is equal to the
radius
of the
circle
.
Ancestors
(6)
Pi
History of geometry
Geometry
Fields of mathematics
Mathematics
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