CK-12 Foundation
Ck 12: Geometry: Triangle Proportionality Grades 9 10
[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to determine if lines in triangles are parallel and find missing lengths using the Triangle Proportionality Theorem.
Texas Instruments
Texas Instruments: Triangle Proportionality
In this activity, students will study the concept of triangle proportionality. [Requires Adobe Reader.]
CK-12 Foundation
Ck 12: Geometry: Triangle Proportionality Grades 8 10
[Free Registration/Login may be required to access all resource tools.] Use the Triangle Proportionality Theorem and its converse.