There are 4 corners in a flat rectangle and 8 corners in a 3d rectangle(rectangular prism).
Four.
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A rectangle has 6 faces, 12 edges, and 8 corners. Wrong, that's a cube.
Five
It has 4 faces, 4 corners, and 4 edges, but two edges are different from each other. All the corners are right angles.
No- the vertices of a rectangle are the four coordinates (corners) not the midpoints.
an heptangle