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radius
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Pronunciation
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IPA
^{(key)}
:
/ˈreɪdi.əs/
Audio (US)
(
file
)
Noun
Edit
Singular
radius
Plural
radii
or
radiuses
(
mathematics
); (
countable
) A
radius
is a
straight
line between the centre of a
circle
and its
circumference
.
To find the
area
of a circle, you have to know the length of the
radius
.