Answer:
Given, AB is diameter of the circle. Also, C is the centre of the circle and PC is the radius. We know that, diameter of a circle \[=2\times \]radius \[=2\times PC\] \[\Rightarrow \]\[d=2\times r\] \[\Rightarrow \] \[d=2r\] Hence, the diameter of the circle in terms of its radius can be expressed as \[d=2r\].
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