Question 15
a) In the following figure, there are seven points on the circumference of a circle. How many triangles can be drawn with any three points as vertices?
b) In the following figure, there are eight points on the sides of a square. How many triangles can be drawn with any three points as vertices?
**Editorial note for this self-study exercise:** Use the marked points only, counting each choice of three distinct vertices once. Three collinear points do not form a triangle. Enter (a) then (b) as integers separated by a semicolon with no spaces.
b) In the following figure, there are eight points on the sides of a square. How many triangles can be drawn with any three points as vertices?
**Editorial note for this self-study exercise:** Use the marked points only, counting each choice of three distinct vertices once. Three collinear points do not form a triangle. Enter (a) then (b) as integers separated by a semicolon with no spaces.