Cutting them in half.
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Divide
Trisect.
We will divide the pie into six equal pieces so everyone will have a slice.
If the shape has high symmetry like a circle then it's easy to do. If not, measure the area, divide it by N (the number of pieces you want) and chop off that quanitity (N-1) times and, with the bit left over you will have N equal pieces.
You can divide any shape into smaller pieces so that all pieces have the same surface area. However, you can no longer divide an arbitrary shape (including an ellipse) into smaller pieces so that all pieces have the same shape.