New answers tagged geometry
5
votes
How can I build a protractor without a protractor?
In mweiss' method, the outer angles ∠AOC and ∠DOB are shy of 1° by slightly more than 0.0001°, and the inner angle ∠COD exceeds 1° by slightly more than 0.0002°.
On a (huge!) one meter diameter ...
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1
vote
How can I build a protractor without a protractor?
Use a sine bar and some gauge blocks to machine a line in a the protractor. Repeat many times.
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13
votes
How can I build a protractor without a protractor?
Step 1: Find a machinable material that is reasonably incompressible.
Step 2. Find a string material that is reasonably non-stretchy.
Step 3: Make a cylinder out of the machinable material (perhaps ...
- 3,041
17
votes
How can I build a protractor without a protractor?
As Will Orrick says in the comments under user20315's answer, it is possible, with straightedge and compass, to construct a regular 120-gon, and therefore it is possible to mark off every 3 degrees on ...
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3
votes
How can I build a protractor without a protractor?
In terms of doing it on paper, it is impossible to trisect (or quintisect) angles with a conventional compass and straight edge. And 180 = 2 * 2 * 3 * 3 * 5. Of course you could be an anti-...
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