[Solved] How to adjust curly brackets or braces within Graphics Text

Questions
1

As you can see from the code below I haven’t found a proper way to adjust the length of the underbrace to fit the length of the base of the triangle.

If I increase its character size its length will be increased together with its thickness and the result is far from being harmonic.
Is there another and more proper way to achieve this result?
Thanks

    Graphics[{EdgeForm[Thick], White, Triangle@{{0, 0}, {3, 8}, {10, 0}}, 
      Text[Style[("︸"), Black, FontFamily -> "Vladimir Script", 
        FontWeight -> {Plain, Thin}, 250], {4.5, 1.5}]}]
2

Maybe try something like this (lots of parameters you can fiddle with here to get exactly what you want):

Underscript[
 Graphics[{EdgeForm[Thick], White, Triangle@{{0, 0}, {3, 8}, {10, 0}}}], 
 Style[\[UnderBrace], 100, FontFamily -> "Vladimir Script"]]

UnderbraceDemo.bmp (453 KB)

3

Hello

With your solution you underscript the whole graphics and not a brace within the graphics code.
I want to add some note below the brace and this cannot be achieved with your code as shown below.

I saw a SpanMaxSize function in the MMA documentation but unfortunately not an single instance of how to use it.

Underscript[
 Graphics[{EdgeForm[Thick], White, Triangle@{{0, 0}, {3, 8}, {10, 0}},
   Text[Style[("c"), Black, Bold, 20], {5.5, -0.5}]}], Style[︸, 100]]

Can it be done ?
Thanks

4

Here are two ways (of very many):

Column[
 {Underscript[
   Graphics[{EdgeForm[Thick], White, Triangle@{{0, 0}, {3, 8}, {10, 0}}}, ImageSize -> 400],
   Style[\[UnderBrace], 100, FontFamily -> "Vladimir Script"]],
  Pane[Style["comment about triangle", Black, Bold, 20], 385, Alignment -> .2]}]

UnderBrace1.bmp (604 KB)

Graphics[
 {EdgeForm[Thick], White, Triangle@{{0, 0}, {3, 8}, {10, 0}}, 
  Text[Overscript[Pane[Style["comment about triangle", Black, Bold, 20], 385, Alignment -> .2], 
    Style[\[UnderBrace], Black, 100, FontFamily -> "Vladimir Script"]], {5, -.9}]},
 ImageSize -> 400]

UnderBrace2.bmp (590 KB)