so

I would work accurately for all steps and round off as appropriate. Otherwise the rounding errors will accumulate.

Bob

]]>So here's the recursive formula:

Bob

]]>All measurements in cm.

if you were given the first measurement, eg 15 cm, how would you express a formula to calculate the rest.

Yes I know if I did not round it all to 2 decimal place it would not work. The point is I don't need .o1 of a cm accuracy to build this in the real world. Can this sort of 'error' be built into a math formula?]]>

B

]]>I have to admit I'm not sure the real world application would stand up to a detailed formula.

The idea was to be able to work out the total design with nothing more than one measurement and a formula.However I was more interested in how such a formula would be expressed rather than if it would work. I could only get it to work by rounding everything to 2 decimal places.I'm not even sure if it would work at larger scale.]]>

T3 4, 4, 4√2

Bob

]]>When he mentions the sides I assume he means the sides of the triangle.

]]>Bob

]]>T1 2, 2, 2√ 2

T2 2√ 2, 2√ 2, 4

T3 4, 4, 4√ 4

etc

??

Bob

]]>2's short sides.so triangle number 2s long side is 4m.

How does that happen?

]]>using what you put above, the closest I can get right now is (using a,b,and c )

c[n]=c[n-a+b]

but that only looks to be part of it.]]>

But I still think before you look at any math you should be able to state the problem, in your own language. It may be a simple recursion a[n]=a[n-1]+a[n-2] or it may be something else.

If you can not clearly state the problem then post the measurements.

]]>