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How to draw a puzzle type connection

in General
I created a plywood wheel 130 cm external Ø and 120 cm internal Ø, 10mm thickness.
https://cad.onshape.com/documents/24f4b79126f724f3850da688/w/716057b7e5240b984d31cb9d/e/ee7c1a9871fa0931e6dbfb30
I want split wheel into the 8 pieces and joint it use "puzzle"-type connection, like this:
How to create such type of connection? Also, how to add rigidity to an assembled wheel? The finished product should be a wheel with crossbars, like this:
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create a sketch on the face of the wheel with the puzzle squiggly.
split the wheel using the sketch.
circular pattern the split.
Draw the puzzle shape and then use Split.
What tools should I use to draw the wavy curved lines of puzzle?
Sketch lines/arcs?
Yep, sketch lines/arcs.
https://learn.onshape.com/learn/course/fundamentals-sketching/
curves that form the connection
I should draw on existing Sketch 1, correct? There are 5 different types of arcs in Arc menu. Not sure which one is suitable for particular case. Or I should use ellipse?
Have a play. See what works. You can always undo. Do the learning center courses linked above.