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Let ABC be an equilateral triangle with ...

Let ABC be an equilateral triangle with side length a. Let R and r denote the radii of the circumcircle and the incircle of triangle ABC respectively. Then, as a function of a, the ratio `R/r`

A

strictly increases

B

strictly decreases

C

remains constant

D

strictly increases for `a < 1` and strictly decreases for `a>1`

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