University of Virginia
Geometrical Proof of Heron?s Formula
Gives a geometrical proof of Heron's formula and discusses its relationship to trigonometry.
Mocomi & Anibrain Digital Technologies
Mocomi: What Is Heron's Formula?
Define's Heron's Formula and provides examples for how to use the formula to calculate the area of a triangle.
Math Is Fun
Math Is Fun: Heron's Formula
Learn a formula, created thousands of years ago, that you can use to calculate the area of a triangle if you know all three sides' lengths.
Texas Instruments
Texas Instruments: Heron's Formula
This activity allows students to find the area of a triangle using Heron's formula.
University of St. Andrews (UK)
University of St. Andrews: References for Heron of Alexandria
This site contains important links on which to learn more about Heron of Alexandria. Is a useful site for anyone doing research on this great mathematician.
University of British Columbia
University of British Columbia: Heron's Criterion
This site from the University of British Columbia describes and provides examples of Heron's Formula.
Math Open Reference
Math Open Reference: Heron's Formula
Learn about corresponding angles with this resource which offers detailed explanations, examples, and interactives. Subjests covered include the area of a triangle. Links to related topics.
CK-12 Foundation
Ck 12: Trigonometry: Heron's Formula
[Free Registration/Login may be required to access all resource tools.] Find the area of a triangle when all three sides are known.
Other
Math Pages: Heron's Formula and Brahmagupta's Generalization
This resource provides detailed information and pertinent graphs dealing with Heron's Formula and Brahmagupta's Generalization. Useful for any student who is studying these two concepts.
Other
Math Pages: Heron's Formula for Tetrahedra
This article explains how Heron's formula is very similar to Pythagoras' Theorem.
University of Illinois
University of Illinois: Calculation of Triangle Area
Discusses how to find the area of a triangle using Heron's formula and provides interactive examples and problems you can solve.
University of St. Andrews (UK)
University of St. Andrews: Biography of Hero
This University of St. Andrews site contains information on the life of Heron as well as his accomplishments.
CK-12 Foundation
Ck 12: Trigonometry: Introduction to the Triangle Area Formula
[Free Registration/Login may be required to access all resource tools.] This lesson covers how to find the area of a triangle using sine.
Math Open Reference
Math Open Reference: Heron
Learn about the life and mathematical discoveries of Greek mathematician, Heron.
Wolfram Research
Wolfram Science World: Heron of Alexandria (Ca. 75 Ad)
Greek mathematician who was mainly interested in practical studies of mechanics and engineering. He dealt with a number of such problems in his work Dioptra. He is best known today for Proposition 1.8 of his Metrica, which is now known...
Analyze Math
Analyze Math: Trapezoid Problems
The geometry tutorial examines the area, length, and vertices of a trapezoid. Topics include Heron's formula. The activity has several examples with detailed solutions.
Math Is Fun
Math Is Fun: Area of Triangles Without Right Angles
Learn how to find the area of triangles without right angles. Find the formula to use depending on the information you know about the triangle: base and height, three sides, or two sides and an angle.
Oswego City School District
Regents Exam Prep Center: Area of a Triangle and Parallelogram Using Trig
How can trigonometry be used to find the area of a triangle or parallelogram? Does the triangle need to be a right triangle, and how accurate can the results possibly be? The answers to these questions are found here along with several...
Curated OER
University of British Columbia: Heron's Criterion
This site from the University of British Columbia describes and provides examples of Heron's Formula.
Curated OER
University of British Columbia: Heron's Criterion
This site from the University of British Columbia describes and provides examples of Heron's Formula.
Curated OER
University of British Columbia: Heron's Criterion
This site from the University of British Columbia describes and provides examples of Heron's Formula.
Curated OER
University of British Columbia: Heron's Criterion
This site from the University of British Columbia describes and provides examples of Heron's Formula.
Curated OER
University of British Columbia: Heron's Criterion
This site from the University of British Columbia describes and provides examples of Heron's Formula.
Curated OER
University of British Columbia: Heron's Criterion
This site from the University of British Columbia describes and provides examples of Heron's Formula.