Investigating Middle School Mathematics On-Line

Strand 4: Geometry

Lesson 4-3: Basic Constructions

Project: Find a picture on the internet (or scan one from a book or magazine) that appears to contain lines, points and angles. Paste your picture into a Geometer´s Sketchpad, C.a.R. or GeoGebra file. Draw each of the 6 basic geometric elements (point, segment, ray, line, angle and parallel lines) on top of the picture, and label them.

Click on the movie to stop it playing.

Copy Angle Close   Copy Segment Close

Bisect Angle Close   Perpendicular Bisector Close

Perpendicular to a point on a line Close   Perpendicular to a point off a line Close