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Proof of Heron's Formula

References and Links

Dunham, William. Journey Through Genius. John Wiley & Sons, Inc. New York. 1990.

Heron's Formula and Brahmagupta's Generalization

Heron's Formula For Tetrahedrons

A Proof of the Pythagorean Theorem From Heron's Formula

Miscalculating Area and Angles of a Needle-like Triangle by William Kahan

Bill Casselman's Math 309