Cutting elements, earth-boring tools including the cutting elements, and methods of forming the cutting elements

A cutting element, comprising:

• a supporting substrate;
• and
• a cutting table attached to the supporting substrate and comprising:
• a substantially planar apex exhibiting first opposing boundaries extending in parallel in a first lateral direction, and second opposing boundaries extending in a second lateral direction perpendicular to the first lateral direction;
• opposing flat surfaces extending upwardly and inwardly toward the substantially planar apex from locations proximate an interface between the cutting table and the supporting substrate;
• curved primary edge surfaces extending from the first opposing boundaries of the substantially planar apex to upper boundaries of the opposing flat surfaces;
• opposing semi-conical surfaces intervening between the opposing flat surfaces and extending upwardly and inwardly toward the substantially planar apex from other locations proximate the interface between the cutting table and the supporting substrate;
• and
• curved secondary edge surfaces extending from the second opposing boundaries of the substantially planar apex to upper boundaries of the opposing semi-conical surfaces, each of the curved secondary edge surfaces having substantially the same radius of curvature as one another.