# Calculating the distance round an arc

1. ## Calculating the distance round an arc

Hi Guys,

Not sure I have worded the title correctly I am looking to calculate the distance around an arc, given A-B = 70
and the depth is 70cm

Thanks  Register To Reply

2. ## Re: Calculating the distance round an arc

To accurately determine the length of an arc you really need the radius of the circle it is taken from.

However, it can be estimated like this

=SQRT(A1^2+16/3*A2^2)

where A1 and A2 are the straight line AB and the ARC AB  Register To Reply

3. ## Re: Calculating the distance round an arc

Hi, Presumably the shape is an ellipse or parabola, as with those dimensions its hard to see how it could be an arc of a circle !!
Regards Mick  Register To Reply

4. ## Re: Calculating the distance round an arc

Hi Guys

Not really an arc or Para whatever.

These are made out of material and have to have a trim round the edge, looking for a way to calculate before the application of the trim

Thanks anyway  Register To Reply

5. ## Re: Calculating the distance round an arc

Hi Guys,

Another one for you

Same excel sheet, sort of a triangle need to know the length of the edge

cheers      Register To Reply

6. ## Re: Calculating the distance round an arc

=sqrt( sumsq( c21-c37, b28-e23)) ~ 170.4  Register To Reply

7. ## Re: Calculating the distance round an arc Originally Posted by shg =sqrt( sumsq( c21-c37, b28-e23)) ~ 170.4

Hi Shg

Thanks for that, have you looked at the 2nd sheet I posted;
I am looking to find the value of a side given all the other sides have sizes attached to them

cheers  Register To Reply

8. ## Re: Calculating the distance round an arc Originally Posted by stephen1000 Hi Shg

Thanks for that, have you looked at the 2nd sheet I posted;
I am looking to find the value of a side given all the other sides have sizes attached to them

cheers
Just put the formula in thats AMAZING          Thank you so much

stephen  Register To Reply

9. ## Re: Calculating the distance round an arc

That was from the second sheet you posted -- it's the length of the chamfer.  Register To Reply

10. ## Re: Calculating the distance round an arc

Hi, With regards to the first Question :- See the attached
Mick  Register To Reply

11. ## Re: Calculating the distance round an arc Originally Posted by MickG Hi, With regards to the first Question :- See the attached
Mick
Thanks Mick  Register To Reply

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