(a) Show that this gives the equation of a line in R2 thru (x2, y2) and (x3, y3).

(b) Prove that the area of a triangle with vertices (x1, y1), (x2, y2), and (x3, y3) is

(c) Prove that the area of a triangle with vertices at (x1, y1), (x2, y2), and (x3, y3) whose coordinates are integers has an area of N or N/2 for some positive integer N.

Transcribed Image Text:

X1 X2 X3