# Anyone Good At Maths? Please Help Me?!

What is the length of the common rafter if the rise is 1.2m and the span is 3.0m?

Use: AB=(Squared)AC2 + CB2

Type in your answer to 3 decimal places

Use: AB=(Squared)AC2 + CB2

Type in your answer to 3 decimal places

Original Poster

Ha, Same ;-)

lol my thoughts exactly

AB=(square route of(1.2^2 + 1.5^2))

AB = (square route of (1.44 + 2.25)

AB= (square route of (3.69))

AB = 1.9209372712298546059464653023865

AB = 1.921 (3dp)

Original Poster

Are You A Roofer Buy Any Chance? Or A Maths Teacher? You A Genius, Thanks, I Left Some Rep :thumbsup::thumbsup:

Sadly neither but did degree and love maths. :thumbsup:

Original Poster

Okay, Well Thanks Again, I Will Send You A Message If I Have Any More Questions If Thats Okay?

yeah ok

The sloping lengths are therefore (1.5x1.5) + (1.2x1.2) and then squre root this answer.

so 1.5x1.5 = 2.25

1.2x1.2 = 1.44

so sloping beam is square root of 2.25+1.44 = 1.921m.

Hope this helps.

Original Poster

I Did Sort Of Understand That, Thanks

Repped+

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