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Two Identities and their Consequences 11

[14] S. H. Kung, Another elementary proof of Heron’s formula, Math. Mag. 65 (1992) 337–338.

[15] B. M. Oliver, Heron’s remarkable triangle area formula, Mathematics Teacher 86 (1993)
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[16] V. Panagiotis, Exercise 400, 1000 General Trigonometry Exercises B.

[17] C. H. Raifaizen, A Simpler Proof of Heron’s Formula, Math. Mag. 44 (1) 27–28.

[18] V. Thebault, The area of a triangle as a function of the sides, Amer. Math. Monthly 52
(1945) 508–509.

[19] P. Yiu, Euclidean Geometry, Florida Atlantic Univesity Lecture Notes (1998), available at
http://math.fau.edu/Yiu/Geometry.html