How many triangles can be formed by joining vertices of a hexagon?  Choose one:
A) 20 B) 30 C) 40 D) 60 E) 10
One triangle is formed by selecting group of three vertices from 6 vertices of a hexagon.This can be done in 6C3 ways. ie) 6!/3!x3!=20 ways. 20ns : 20
<result>A</result>
How many triangles can be formed by joining vertices of a hexagon?