Englishfor English speakers
radius
Noun
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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.
of
Preposition
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Made using.
It is a house of cards.
convexity
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noun
the property possessed by a convex shape
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noun
(= convex shape)
a shape that curves or bulges outward