2 radii = one diameter
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The sum of two radii of a circle is the same as the diameter of the circle.
They are seperate from each other that said,none of each other's business:)
Tangent circles are circles that touch one another without crossing. The distance between the centres of the circles must be equal to the difference or the sum of their radii.
the single form of radii is radius
It is radii which is the plural of radius