How do I delete a portion of a previously drawn arc?

Hello
I was asked to make a wedge allowing a window to be well held by a metal hinge.
I drew a sketch including an arc of a circle of 270° (3/4 of a circle). I now want to reduce the angle of the arc a bit (the radius doesn't change) but I don't know how to go about it (I don't understand all the fields in the dialog box associated with the arc).

Thank you in advance for your help.
Kind regards.

Hello Yohan,
Welcome to the forum.
In the " sketch" toolbar, take a closer look at this tool:
image
You'll see, it's almost magical...

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Thank you very much a.eriaud.

It worked well. It now remains for me to constrain the arc of the circle again.

Your solution is much simpler than I imagined. Indeed, I don't understand some fields in the arc of the circle dialog.

Hello @yohan.roche

Yesterday we dealt with the problem of adjusting the radii

For the adjustment proposed by @a.eriaud (whom I salute by the way) there is a trick with this tool. Watch this mini video
I would also partially respond to the radius adjustment

Kind regards