All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Shapes > Geometry
Tree planting exercise (Posted on 2006-10-21) Difficulty: 3 of 5
How can you plant seven straight rows of trees with six trees per row such that twenty-one trees are planted in total?

How can you plant nine straight rows of trees with three trees per row such that nine trees are planted in total?

  Submitted by JLo    
Rating: 2.0000 (2 votes)
Solution: (Hide)
1. You draw an acute heptagram and plant your trees at the intersection points.

2. Choose the points and lines of a pappus configuration as trees and rows. As Tristan noticed, even ten rows can be accomplished when choosing the points correctly.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Puzzle Thoughts K Sengupta2023-03-19 00:53:56
Solutionpart 2nikki2006-11-10 18:08:15
re(3): 9 rows, 9 treesRichard2006-10-23 19:59:15
re(2): 9 rows, 9 treesbrianjn2006-10-23 18:48:57
re: 9 rows, 9 treesRichard2006-10-23 14:51:35
Solution9 rows, 9 treesbrianjn2006-10-23 03:44:58
part1Art M2006-10-22 16:06:15
re: part 1brianjn2006-10-21 21:51:01
Solutionpart 1Charlie2006-10-21 19:27:58
SolutionPart 2Tristan2006-10-21 17:08:59
Solution?George2006-10-21 16:02:03
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (3)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2024 by Animus Pactum Consulting. All rights reserved. Privacy Information