Activity
Analyze Math

Analyze Math: Area of Triangles

For Students 9th - 10th Standards
The geometry resource explores the different formulas used to calculate the area of triangles. The applet investigates the angles and sides of a triangle.
Unit Plan
CK-12 Foundation

Ck 12: Trigonometry: Introduction to the Triangle Area Formula

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] This lesson covers how to find the area of a triangle using sine.
Handout
Cuemath

Cuemath: Heron's Formula and Quadrilaterals

For Students 9th - 10th
A comprehensive guide for learning all about Heron's Formula and quadrilaterals with numerous solved examples.
Handout
Math Open Reference

Math Open Reference: Heron's Formula

For Students 9th - 10th
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.
Handout
Cuemath

Cuemath: Cosine Law

For Students 9th - 10th Standards
A comprehensive guide for learning all about the law of cosine with definitions, what is the law, and solved examples.
Handout
Math Open Reference

Math Open Reference: Area of an Equilateral Triangle

For Students 9th - 10th Standards
Learn about the area of an equilateral triangle with this helpful reference tool. Provides a detailed definition, examples, and an internet activity that enhances further explanation. Includes links to related topics.
Unit Plan
Other

Math Pages: Heron's Formula and Brahmagupta's Generalization

For Students 9th - 10th
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.
Handout
Math Open Reference

Math Open Reference: Heron

For Students 9th - 10th
Learn about the life and mathematical discoveries of Greek mathematician, Heron.
Interactive
Mocomi & Anibrain Digital Technologies

Mocomi: What Is Heron's Formula?

For Students 2nd - 8th
Define's Heron's Formula and provides examples for how to use the formula to calculate the area of a triangle.
Handout
Wolfram Research

Wolfram Science World: Heron of Alexandria (Ca. 75 Ad)

For Students 9th - 10th
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...