Three of the six vertices of a regular hexagon are chosen the random. What is the probability that the triangle with these vertices is equilateral.

Three of six vertices of a regular hexagon are chosen at random.The probability that the triangle with three vertices is equilateral is (a) (1)/(2) (b) (1)/(5) (c) (1)/(10) (d) (1)/(20)

Three vertices are chosen at random from the vertices of a regular hexagon then The probability that the triangle with these vertices is an equilateral triangle is equal to

If three vertices of a regular hexagon are chosen at random, then the chance that they form an equilateral triangle is :

If four vertices a regular octagon are chosen at random, then the probability that the quadrilateral formed by them is a rectangle is

Two vertices of an equilateral triangle are origin and (4, 0). What is the area of the triangle ?