My Math Forum  

Go Back   My Math Forum > High School Math Forum > Geometry

Geometry Geometry Math Forum


Thanks Tree2Thanks
  • 1 Post By skipjack
  • 1 Post By skipjack
Reply
 
LinkBack Thread Tools Display Modes
October 7th, 2014, 01:12 PM   #1
Newbie
 
Joined: Feb 2014

Posts: 29
Thanks: 1

A parallel projection problem

Parallel projection of the rectangle ABCD at the plane is the A1B1C1D1 polygon. Find CC1 if АА1=3 сm, ВВ1 = 4 сm, DD1= 6 сm.
Drasik is offline  
 
October 7th, 2014, 04:17 PM   #2
Global Moderator
 
Joined: Dec 2006

Posts: 20,835
Thanks: 2162

Use AA1 + CC1 = BB1 + DD1.
Thanks from Drasik
skipjack is offline  
October 8th, 2014, 08:55 AM   #3
Newbie
 
Joined: Feb 2014

Posts: 29
Thanks: 1

Thanks! Makes sense to me. But how do I explain it? Is there a theorem or something?
Drasik is offline  
October 10th, 2014, 08:13 AM   #4
Global Moderator
 
Joined: Dec 2006

Posts: 20,835
Thanks: 2162

As ABCD is a rectangle, AC and BD have a common midpoint.
Consider what happens to AC and BD separately under the parallel projection.
Apply the Midpoint Connector Theorem for Trapezoids.
Thanks from Drasik
skipjack is offline  
October 11th, 2014, 07:08 AM   #5
Newbie
 
Joined: Feb 2014

Posts: 29
Thanks: 1

Thank you! I got it now
Drasik is offline  
Reply

  My Math Forum > High School Math Forum > Geometry

Tags
parallel, problem, projection



Search tags for this page
Click on a term to search for related topics.
Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
A problem with parallel planes Drasik Geometry 1 October 7th, 2014 06:25 AM
Problem with deriving oblique projection eq zak100 Geometry 1 April 6th, 2014 08:55 AM
On Parallel Transport and the Parallel movement of Vectors Anamitra Palit Physics 3 December 6th, 2012 01:20 PM
projection? xzardaz Linear Algebra 0 February 3rd, 2012 03:47 AM
Inverse Projection Problem velcrome Linear Algebra 0 April 28th, 2008 03:43 AM





Copyright © 2019 My Math Forum. All rights reserved.