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Create a UV Sphere and delete the bottom half of it in Edit Mode. Go back into Object Mode, select the entire half-sphere and scale it only on the Z axis. (press "Z" while scaling is activated) That should give you a concave disk.
Create a UV Sphere and delete the bottom half of it in Edit Mode. Go back into Object Mode, select the entire half-sphere and scale it only on the Z axis. (press "Z" while scaling) That should give you a concave disk.
Create a UV Sphere and delete the bottom half of it in Edit Mode. Go back into Object Mode, select the entire half-sphere and scale it only on the Z axis. (press "Z" while scaling is activated) That should give you a concave disk.
Create a UV Sphere and delete the bottom half of it in Edit Mode. Go back into Object Mode, select the entire half-sphere and scale it only on the Z axis. (press "Z" while scaling) That should give you a concave disk.