Author |
Topic: Pyramid plane (Read 1114 times) |
|
codpro880
Junior Member
Teachers strike, students hurt. English...
Gender: 
Posts: 89
|
 |
Pyramid plane
« on: Feb 8th, 2009, 6:14pm » |
 Quote  Modify
|
In pyramid PWXYZ, WYXZ is a rectangle and PW = PX = PY = PZ.
A plane cuts segments PW, PX, PY, and PZ at
points A, B, C, and D, respectively.
If PA = 2, PB = 12, and PC = 4, compute the length of PD.
|
|
 IP Logged |
You miss 100% of the shots you never take.
|
|
|
Noke Lieu
Uberpuzzler
pen... paper... let's go! (and bit of plastic)
Gender:
Posts: 1884
|
|
Re: Pyramid plane
« Reply #1 on: Feb 8th, 2009, 9:15pm » |
Quote Modify
|
[usual nonsense to cover me, because I didn't think about it too much]
It'd strike me that this would crop up in a text book under ratios, rather than geometry.
|
|
IP Logged |
a shade of wit and the art of farce.
|
|
|
Noke Lieu
Uberpuzzler
pen... paper... let's go! (and bit of plastic)
Gender:
Posts: 1884
|
|
Re: Pyramid plane
« Reply #2 on: Feb 9th, 2009, 7:35pm » |
Quote Modify
|
goes to show what I know. 
As P was central above PXYZ, I figured AB parallel to CD; and BC to AD.
then (PB/PC) = (PA/PZ) giving value of 2/3
Australians, walking upside down and all that... 
|
|
IP Logged |
a shade of wit and the art of farce.
|
|
|
|
RIDDLES SITE
WRITE MATH!
Home 
Help 
Search 
Members 
Login 
Register
Reply
Notify of replies
Send Topic
Print