triangle with 179 degrees?????

[expaddy]

Hi folks,

My problem is that I was doing an exercise from my book and when I constructed a triangle and measured the internal angles they added up to 179 degrees??? I was in3d/views front and constructed the triangle from a base line of 70mm and a height of 80mm I then tried to rotate the said object 24 degrees and when I did I found it would not rotate properly. It was then I measured the internal angles and found that either rotated or not they were 179???? I created the triangle ok in the end but am now very curious as to how this can happen

[fuccaro]

Hello Expaddy!
Probably you are a victim of a rounding problem. A 25.05%%d angle could be displayed as 25%%d.
How did you measure the angles? If you placed angular dimensions on the 3 angles, you should check the precision. Select a dimensions and click CTRL+1 if the Properties window is not visible on the screen. Go to Primary Units > Angle Precision and select a higher precision. Did the display changed?
Be sure that in any triangle the sum of the angles is 180%%d. You don’t trust me? -Ask Euclid!

[expaddy]

Thx for your answer fuccaro but I dont need reminding that a triangle must contain 180 deg

When I measured the angles before I rotated the triangle they were 180 degrees, it was only when the circle was rotated that one angle changed, the other 2 included angles didnt change??

I think it may be that I was in 3d/views front??

I rotated as both lines and as polyline and point of rotation did not matter either.

Cmon guys get to the root of this problem

[boarderx1x]

Make sure your UCS is set to world. Using 3D orbit check your endpoints. Make sure that nothing is overlapping. Try to pedit together and if it doesnt work, then its not a closed object.

[Mr T]

Hi folks,

My problem is that I was doing an exercise from my book and when I constructed a triangle and measured the internal angles they added up to 179 degrees??? I was in3d/views front and constructed the triangle from a base line of 70mm and a height of 80mm I then tried to rotate the said object 24 degrees and when I did I found it would not rotate properly. It was then I measured the internal angles and found that either rotated or not they were 179???? I created the triangle ok in the end but am now very curious as to how this can happen

We could solve/investigate it if you post it up.

I reckon you dimensioned it and didn't quite get it snapping right.

Of course (here he goes again) in Inventor it AUTOMATICALLY dimensions it for you.

Nick

[expaddy]

thx for your answers guys but I solved the problem long ago

And yes everything was checked before rotating and I mean everything, UCS, pedit to make one line, angles checked before rotation, lengths checked before rotation and yes it was closed. But when I rotated it measured 179. HONEST

But when I came back to the problem the next day everything worked.
So I'm ffd if i no