I guess this is technical

[Brazen]

This is really aggrevating for me considering I aced high school math, and this is exactly why we need to learn the things we learn in high school math. Anyway, the board has to be angled to a point, to fill a gap, but I only have ten foot boards. I drew a diagram you can see here.

AC is the edge of the board, so of course angle A is 90. AC is 3.5 inches, AB is 162 inches, and AE is 120 inches. What I need to know is the lengh of line DE (AEDC will be the border of the board).

I would even be happy if someone would help walk me through solving the problem myself. It makes me sick, I know this would've taken me like 10 minutes back in high school, but I guess if you don't use it, you lose it.

 

[MrDudeMan]

i cant see the picture. host it somewhere else.

 

[Brazen]

How about this?

 

[MrDudeMan]

why dont you just use a big pic hosting site like pics.bbzzdd.com? both of those sites are taking too long and they timeout for me.

 

[djhuber82]

Triangles ABC and EBD are similar (same angles) so their sides will have the same proportions. So, DE/BE = AC/AB and DE = (AC*BE)/AB = 3.5*42/162 = 0.91

 

[Brazen]

I've never used pics.bbzzdd.com, it will take a minute... Funny, I just tried the original links from work, and they work fine....

 

[Brazen]

Ok, changed the links to pics.bbzzdd.com.

 

[Brazen]

Originally posted by: djhuber82
Triangles ABC and EBD are similar (same angles) so their sides will have the same proportions. So, DE/BE = AC/AB and DE = (AC*BE)/AB = 3.5*42/162 = 0.91

Ach, of course. Forgot all about that rule (obviously). I was trying to find the length of the third side and then find angles and junk. Which I suppose would have worked but I was getting lost in the cosines and sqr root arithmetic.

 

[MrDudeMan]

dang it i wanted to answer it

 

[Brazen]

Originally posted by: Bigsm00th
dang it i wanted to answer it

haha, sorry I'll pm you if I have any more!

 

[Heligrin]

Or you can use trig, but WHO wants to use that stuff

 

[Brazen]

Originally posted by: Heligrin
Or you can use trig, but WHO wants to use that stuff

Hey, I already said I tried! When I was in school, I aced this stuff. That's been years ago though, and I haven't really used it since college...

 

[ta8689]

a^2+b^2=c^2

 

[ta8689]

im gunna say about .90 inches....