finding the diameter of a tube

campa

How can you find the diameter of a tube without measuring it? Is there a equation or something or any method other than measuring it

Nylex

If you know the cross sectional area, A of the tube, you can use

[tex]A = \pi \left(\frac{D}{2}\right)^2[/tex] and solve for D.

Other than that, no.

Edit: if you know the circumference of the circle, C: [itex]C = \pi D[/itex].

brewnog

Kind of, although strictly speaking, it is 'measuring'.

Just put a stick of known length inside the tube, and turn it through an angle (so it goes from one chord to another chord, with one point remaining the same). Measure the angle between the two chords, and then get trigg-ing!

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campa	finding the diameter of a tube Tweet How can you find the diameter of a tube without measuring it? Is there a equation or something or any method other than measuring it

Nylex	If you know the cross sectional area, A of the tube, you can use [tex]A = \pi \left(\frac{D}{2}\right)^2[/tex] and solve for D. Other than that, no. Edit: if you know the circumference of the circle, C: [itex]C = \pi D[/itex].

brewnog Recognitions: Gold Member Science Advisor	Kind of, although strictly speaking, it is 'measuring'. Just put a stick of known length inside the tube, and turn it through an angle (so it goes from one chord to another chord, with one point remaining the same). Measure the angle between the two chords, and then get trigg-ing!