In a triangle with one angle (2pi)/(3), ...

In a triangle with one angle `(2pi)/(3),` the lengths of the sides form an A.P. If the length of the greatest side is 7 cm, the radius of the circumcircle of the triangle is

`(7sqrt3)/(3)cm`

`(5 sqrt3)/(3)cm`

`(2sqrt3)/(3) cm`

`sqrt3 cm `

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