Date: May 28, 2013 11:30 AM
Author: Michael
Subject: Name this formula
Today our teacher showed us a way to solve problems like this:

/\

./ \

../ \

8 .../ \

..../ \

...../_____\

....../ 10 \

X ......../ \

........../ \

............/__________________\

15

Find X. He posted a way that almost took him up to 20 minutes to explain but i was thinking about this

15-10=5

10/5=2

That means 8 is 2 times bigger then X

so x/2=4

But he said that I couldent use it unless i could prove it .

So is there allready a formula like this one or any way to prove it works?