Maths Question

[matthew]

Can someone please tell me how to calculate the length of a roof when you have the angle of the the roof and the adjacent length?

Basically have the length using google earths measurement but this does not factor in the slope of the roof.

Thank you!

 

[MattBackHome]

SOHCAHTOA innit.

 

[essbee]

Get up there and measure it, you lazy bast**d

 

[StonehamPark]

BODMAS - Right?

 

[Titanic]

Can you draw a simple picture, with the known values?

 

[StonehamPark]

Can you draw a simple picture, with the known values?

 

[Gwylan]

The cat sat on an orange and howled horribly

 

[Herr Tubthumper]

The cat sat on an orange and howled horribly

Silly old harry......

 

[Gazwag]

The cat shit on an orangetree and howled horribly

Not surprised with a hot poker up its arse

 

[Colonel Angus]

OK, I'll bite.

A roof is a prism (if you have a normal shape roof, but maybe yours is like an aubergine; you might want to look into this) and there is nothing you can do with the properties of the end face that will tell you the roof length which can be anything).

I recommend that you measure the length of your street, then measure the lengths of all the other houses (and the gaps between the houses) and subtract them all from the street length and you should have your answer.

Good luck!

 

[matthew]

Best I can do - Not sure if the angle's is the right place..

 

[StonehamPark]

View attachment 67464

Best I can do - Not sure if the angle's is the right place..

That's acute picture.

 

[Arthritic Toe]

cos(30)=16/x
Therefore x=16/cos(30) = 16/0.866 = 18.475

 

[Lord Bracknell]

Pleeeease ... Not another thread about pi.

 

[ringmerseagulltoo]

You could go into the loft and measure it then allow a bit for the eaves overhang.

 

[matthew]

cos(30)=16/x
Therefore x=16/cos(30) = 16/0.866 = 18.475

Yes. Thank you!

 

[Mackenzie]

Count the tiles?

 

[smeariestbat]

i'm gonna be a builder, when the **** am I gonna need trigonometery.
dopey ******* teacher, you dont know **** all.