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I guess this is technical

B

Brazen

Diamond Member
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.
 
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.
 
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
 
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....
 
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
Click to expand...

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