Making a angle from a scetch

[Anonymous]

Hi 

I have been making a sketch

when i create 3 lines and then i make a 90 degree angle and it gives me a angle "BOX"

But now when i was trying to do it the next day the angle box wasn't showing up so when i change the dimension the angle doesn't stay in place 

It is showing a backwards T instead of the angle box 

is there a setting that was turned off? am i doing something wrong?

[jhackney1972]

Please post a screen capture of what you are doing and seeing to help others troubleshoot your issue.

[Anonymous]

Thanks for your response! 

please see attached 

when i make a 90 degree it used to come in as a angle now it doesn't 

[jhackney1972]

What you are seeing when you sketch a line is the ability to enter the length and/or angle.  You can press the Tab key to lock either value after you enter them to move to the next entry.  Caution, do not move your mouse until you press the Tab key or it will reset your typed in length.  The symbol, you called an upside down T, is the symbol for a Perpendicular sketch constraint.  Fusion 360 tries to automatically add sketch constraints as you sketch if they apply, such as horizontal, vertical and perpendicular, the one you are asking about.  You can also manually add these sketch constraints.  It is important to have your sketch fully constrained before moving into the modeling stage.  This will prevent the sketch from moving by accident.  Dimensions also act to constrain a sketch.  Take a look at the screencast and see if it helps.  I would suggest looking int the tutorials for sketching help. One of these can be found here.