Exercises in geometry

(1) Trace "intersect for segments s1 and s2, where
 
   s1.p1=(1,1), s1.p2=(3,3)
   s2.p1=(3,1), s2.p2=(1,3)

(2) Trace "intersect for segments s1 and s2, where

   s1.p1=(2,2), s1.p2=(3,3)
   s2.p1=(3,1), s2.p2=(1,3)

(3) Trace Graham's algorithm for p1, ..., p9 given by

   (7,1), (9,2), (10,3), (14,6), (11,8), (10,10), (4,8), (2,3), (5,1)

Before trace, draw those points on a graph sheet.

(4) Trace the function "inside" in page 55 with p[1], ..., p[5] given by

   (0, 0), (5, 1), (4, 3), (6, 2), (3, 7)

and v = (3, 2).