Answer :

Let the smallest term be x, and the largest term be 2x


Then AP formed= x, ?, ?, 2x


so,




360°= 4/2 [x+ 2x]....[We know that a+(n-1) d= last term= 2x]


180°= 3x


x= 60°


Now, 60° is least angle.


= 60°= π/180° × 60°


60° = π/3 rad


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