Texas Education Agency
Texas Gateway: Describing and Drawing Cross Sections
Given a verbal and/or pictorial description of the intersection of a plane with various three-dimensional geometric figures, the student will describe and/or draw the intersection.
CK-12 Foundation
Ck 12: Geometry: Segments From Secants
[Free Registration/Login may be required to access all resource tools.] Apply the Two Secants Segments Theorem.
PBS
Pbs: Ditch Digger: Coordinate Pairs
Figure out whether two ditch diggers are digging in a single line. This interactive exercise focuses on using what you know about rate of change and lines to make a prediction about whether two lines will intersect and then requires...