Help with triangle shawl...

[kellyspirits10]

I inadvertent made a triangle shawl longer at the sides than the back.  How can I extend the back?  Is there a simple lacy pattern you would add?  What else?  Thank you for your much needed help! ❤️

Edited February 7, 2020 by kellyspirits10

[Granny Square]

Could you post a pic?  In a post, below the area you type in, you can drag a photo or navigate to a photo on your device and choose it.  Seeing it would help us suggest solutions.  I assume it is a 90° triangle? 

Hopefully someone else comes by and has an idea or tells me my recollection of right angle triangle geometry is wrong, but adding an edging to 2 the sides that form the point is going to add twice as much to the width than the depth.  So adding an edging won't be any different than continuing to add rows to the shawl.  You do want a shawl to extend past your 'wingspan' (arms held out from your sides) for several inches, otherwise unless you keep it pinned it's hard to keep in in place.

Edit - added a sketch.  Smaller triangle is 'now', bigger, outside one is adding whatever edging or continuing with the pattern for a distance.  The red lines are (geometry-wise) the same length, so adding the same amount all around adds 2x to the width than is does to the depth.

 

 

 

 

Edited February 7, 2020 by Granny Square