Hey you Geometry whizkids...

[Haywire]

Can you solve for A? This is a roofing question. --Ian

 

[milkman636]

12.69"

 

[bcp]

Not too hard.

 

[EE_Bota]

Not too hard.

:laughing::laughing::laughing:

 

[Haywire]

thanks MM

 

[Mace Canute]

What? No thanks to bcp?? :laughing:

 

[gullyf]

12.69"

Not too hard.

Both are correct

 

[Gods Country]

12.69"

That's what my cad says.

 

[gullyf]

That's what my cad says.

...and I thought I was being fancy by using Excel for the tangent instead of the old paper lookup tables ...

 

[sldva00]

You all get F's.

You're suppose to show your work.

A = 6' / Tan(80) = 1.058'
1.058' * 12"/1' = 12.7"

 

[Redneck in training]

You all get F's.

You're suppose to show your work.

A = 6' / Tan(80) = 1.058'
1.058' * 12"/1' = 12.7"

or you can try this one:
a=tan(90-80)*6*12=1.058'=12.69"

 

[Ordite]

When I was in school the solutions shown here were considered to be trigonometry rather than geometry.

 

[piller]

The answers given for the problem as stated are correct. However this was offered as a roofing question and 10 degrees seems a little unusual to me, it works out to a 2.116 / 12 roof pitch. Is this angle/pitch correct?

 

[300UGUY]

Not a hard trig problem, you got lots of folks with the right answer. But, it does seem like a low pitch roof, and most roofing I've done, I pretty well eyeball this stuff. Maybe use a framing square?

 

[Redneck in training]

The answers given for the problem as stated are correct. However this was offered as a roofing question and 10 degrees seems a little unusual to me, it works out to a 2.116 / 12 roof pitch. Is this angle/pitch correct?

My house and barn metal roofs have 4/12 pitch. We have significant snowfall in the winter.

 

[Haywire]

How about the length of B?

Ian

 

[Haywire]

The answers given for the problem as stated are correct. However this was offered as a roofing question and 10 degrees seems a little unusual to me, it works out to a 2.116 / 12 roof pitch. Is this angle/pitch correct?

It was eyeballed instead of calculated. Snow isn't a significant factor here. I'm building a small chicken coop next to my wood shed and want the roof pitches to match approximately. I'm not much of a carpenter, geometry class was 25 years ago and I never took trig. :laughing:

Ian

 

[TedLaRue]

The length of B is approximately 6.0925596713144699114053061099508 feet.

Or about 6' and 3/32 inches. << EDIT...previously incorrectly said 3/16

 

[Mace Canute]

The length of B is approximately 6.0925596713144699114053061099508 feet.

Or about 6' and 3/16 inches.

Oh sure! Round it off why not??

 

[Haywire]

Thanks...

Ian