I never learned the formulas. I took a piece of graph paper, marked points 0,4, and 2, 0 and I found the point of symmetry. Then I used the same line to find the other point for 7, 3.
My son
所有跟帖:
• That was my son's explanation. accidentally only wrote "My son" -rlmom- ♀ (0 bytes) () 09/04/2010 postreply 06:09:24
• "marked points 0,4, and 2, 0". The points should be (4, 0) and ( -BeLe- ♀ (164 bytes) () 09/04/2010 postreply 06:26:10
• rl's explanation -rlmom- ♀ (135 bytes) () 09/04/2010 postreply 06:31:28
• I folded a piece of graph paper, and found (m,n) to be roughly ( -BeLe- ♀ (86 bytes) () 09/04/2010 postreply 06:44:02
• 回复:I folded a piece of graph paper, and found (m,n) to be roughl -rlmom- ♀ (510 bytes) () 09/04/2010 postreply 07:06:23
• your way -rlmom- ♀ (235 bytes) () 09/04/2010 postreply 07:20:53
• "with virtually any slope". That is not true. -BeLe- ♀ (92 bytes) () 09/04/2010 postreply 07:24:27
• The two lines are not parallel. Instead of a paralleogram, you s -BeLe- ♀ (234 bytes) () 09/04/2010 postreply 07:21:09
• 回复:The two lines are not parallel. Instead of a paralleogram, yo -rlmom- ♀ (248 bytes) () 09/04/2010 postreply 07:39:48