
Steps
Hover over the "Slot" icon in the toolbar.
Click the "3-Point Arc Slot" to enter 3-Point Arc Slot mode.
Create a 3-point arc slot:
Left-click in the drawing area to define the start point of the arc slot.
Move the cursor and left-click to define the end point of the arc slot.
Left-click to define an intermediate point of the arc slot.
Move the cursor again and left-click to define the slot width.
(Optional) Enter a value and press Enter to apply dimensional constraints.
Right-click or press Esc to exit.
Step 1 - Hover over the "Slot" icon in the toolbar:

Step 2 - Enter 3-Point Arc Slot mode:

Step 3 - Left-click to define the start point of the arc slot:

Step 4 - Left-click to define the end point of the arc slot:

Step 5 - Left-click to define an intermediate point on the arc slot:

Step 6 - Left-click to define the slot width:
