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A bigger minus.
a minus and a plus equal a minus number yeh dude
In geometry, a tetrahedron is a solid with four faces, which is a triangular pyramid (don't forget the base-face), and a regular tetrahedron has (4) faces that are equilateral triangles.
They are the First Quadrant, the Second Quadrant, the Third Quadrant, and the Fourth Quadrant. They all meet at the origin, and all have equal, infinite areas.
You cannot have a quadrant (a quarter) in a shape that is divided into 9 parts!