Geometry Help

You need to add it to itself 7 times to make a heptagon.

N-gon 3 4 5 6 7 8 N Angle 120 90 72 60 51.4285 45 360/N

A six sided one would be a lot easier to build!

Regards, Martin Brown

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51.4286 degrees

news:652mouhmuvtjsv9b2fnolpnektf24@4ax.com

Don't know about Paint, but...

51 degrees (3/7) for a heptagon.

I don't know, maybe semantics if I have one and add it to itself six times, I have 7.

I don't know what those two lines are supposed tell me.

Here's the program I'm rotating with.

It was, now I want 7 sides.

Hi John, I have one try at 51.43 and it could be right for the top left and right sides, but what is the next angle From vertical? It measures around 12 degrees but doesn't work when using the program.

Could be I'm not using the program for it's designed purpose. Your link didn't work. Thanks, Mikek

But you have to go 360 degrees to get back where you were. For a triangle, you have to turn three times, 120 degrees each to get back to the original bearing.

For each N-gon (first row) the angle (second row) you need to turn at each corner to complete the N-gon. For a triangle (equilateral) at each corner you would turn 120 degrees (60 degree interior angle).

360/7 = 51.42857 change in direction, or an interior angle of 128.57143 degrees.

I have spent time working with 51.43 and I'll try some more. So I start with a vertical line and rotate it to 51.43, now for the second side, do I add 51.43 + 51.43 = 102.86? If so, I'm feeling the rotation program isn't working for my need. If I can get 3 sides I can flip it horizontal for the other 3 sides, and then draw in the bottom. Thanks, Mikek

Use a 7/2 or 7/3 method:

halfway down the page.

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It looks like you have to enter 51.43 to get the first skews and
stretches, then 102.86 to get the next set, and so on around the
circle.

~64.286 degrees is correct.

The sum of interior angles in a polygon is (n-2) * 180°, so you want

1/2 * 1/7 * (5 * 180) degrees = 450/7 degrees.

Maybe try something other than MS paint, like a real CAD program?

Best regards, Spehro Pefhany

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Embedded software/hardware/analog  Info for designers:  http://www.speff.com

You increment the bearing 51.43 degrees at each corner if the drawing program uses absolute directions. If it uses relative directions you just use the

51.43 degree number. "Flipping" it just adds confusion.

Use your calculator or a small program or script (it could probably be done on a spreadsheet) that gives you coordinates for the points, then draw them while referring to the "x,y" display on your paint program, then connect the dots.

Have Fun! Rich