Question

a) Use combinations to determine how
many diagonals there are in
i) a pentagon ii) a hexagon

How do i do in terms of combinations???

Answer 1

whats the definition of a diagonal ?

Answer 2

that looks like a line segment to me

Answer 3

a straight line joining two opposite corners of a square, rectangle, or other straight-sided shape.

Answer 4

A diagonal is a segment joining two non adjacent vertices

Answer 5

a side is a segment joining two adjacent vertices

Answer 6

oh okay

Answer 7

there are 5 vertices in a pentagon,
and for each vertex there are 2 non adjacent vertices, yes ?

Answer 8

that means you can draw exactly `2` diagonals from each vertex