It means to divide the shape into 4 equal quarters.
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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.
Cut it in half through its centre. Then cut each half into half. You will have four fourths.
You can divide it into halfs, fourths, eighths, sixteenths, thirty seconds, etc.
You divide 3 by 4.
Divide it by four