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

Home > Just Math
The Ladder (Posted on 2003-12-09) Difficulty: 2 of 5
A 3' cube sits on level ground against a vertical wall. A 12' ladder on the same ground leans against the wall such that it touches the top edge of the box.

How far from the wall must the foot of the ladder be, if it is to reach maximum height whilst meeting the foregoing conditions?

See The Solution Submitted by retiarius    
Rating: 3.5714 (7 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): solution | Comment 5 of 20 |
(In reply to re: solution by Penny)

Penny, draw a 3-inch square on a paper, and extend the bottom to the right to represent the floor. Extend the left side upward to represent the wall. Then get a 12-inch ruler. See that if you make the ruler be at a 45-degree angle, touching the wall and the floor at the ends of one of its edges, that it will not touch the 3-inch square at all. You have to bring the base in, while raising the end on the wall, so as to allow the ruler just to touch the top right vertex of the box.

(or you could bring the top down while the bottom goes right, but that would not maximize the height.)

And Penny, you'd better get some sleep if you are this exhausted.
  Posted by Charlie on 2003-12-09 11:44:03

Please log in:
Remember me:
Sign up! | Forgot password

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

Copyright © 2002 - 2018 by Animus Pactum Consulting. All rights reserved. Privacy Information