Mathigon
Mathigon: Geometry: Triangles and Trigonometry: Properties of Triangles
This lesson focuses on the properties of triangles, a closed shape that has three sides, three vertices, and and three internal angles. There are different types of triangles such as a right triangle, obtuse, and acute based on the...
Cuemath
Cuemath: Midsegment of a Triangle
This mini-lesson explores the world of the midsegment of a triangle by finding the answers to questions like what is midsegment of a triangle, triangle midsegment theorem, and proof with the help of interactive questions.
Texas Instruments
Texas Instruments: Cabri Jr. Side Splitter Theorem
Cabri Jr. activity to study the Side-Splitter Theorem. Page numbers come from Prentice Hall Geometry textbook.
CK-12 Foundation
Ck 12: Trigonometry: Angle Angle Side Triangles
[Free Registration/Login may be required to access all resource tools.] Find the unknown side of a triangle when two angles and a side are known.
CK-12 Foundation
Ck 12: Geometry: Third Angle Theorem Grades 8 10
[Free Registration/Login may be required to access all resource tools.] Apply the Third Angle Theorem.
CK-12 Foundation
Ck 12: Geometry: Third Angle Theorem Grades 9 10
[Free Registration/Login may be required to access all resource tools.] This concept introduces students to the Third Angle Theorem.
CK-12 Foundation
Ck 12: Altitudes: Orthocenter
[Free Registration/Login Required] Students will use the interactive riangle and points to explore altitudes such as the orthocenter. Click learn more to watch a video and click challenge me to answer a practice question.
Khan Academy
Khan Academy: Find Base and Height on a Triangle
Identify the height of a triangle when given the base. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Analyze Math
Analyze Math: Medians of Triangle
The properties of the medians of a triangle are explored using an interactive geometry applet.
CK-12 Foundation
Ck 12: Geometry: Altitudes
[Free Registration/Login may be required to access all resource tools.] Apply the properties of altitudes.
CK-12 Foundation
Ck 12: Trigonometry: Angle Side Angle Triangles
[Free Registration/Login may be required to access all resource tools.] Find the unknown side of a triangle when two angles and the included side are known.
Math Open Reference
Math Open Reference: Altitude of a Triangle
Learn about the altitude of a triangle with this handy reference tool. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Medians of a Triangle
Learn about the medians of a triangle with this helpful reference tool. Provides a detailed definition and internet activities that enhance further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Midsegment of a Triangle
Learn about the midsegment of a triangle with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
Math Open Reference
Math Open Reference: Hypotenuse
Learn about the hypotenuse with this helpful reference tool. Provides a detailed definition and examples that enhance further explanation. Includes links to related topics.