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Label the intersection points D and E respectively. Then construct the bisector of ∠ABC by following the procedure outlined below:  Step 1: With the compass point at B, draw an arc that intersects BA and BC. Įxploring Constructions with Geometer’s Sketchpad  G.PS.4b, G.CM.5d, G.G.17a, G.G.28a Use a straightedge to draw an angle and label it ∠ABC.  Write a proof that segment CD is the perpendicular bisector of segment AB. Label the intersections of the two arcs C and D.  Step 2: With the compass point at B, draw a large arc with the same radius as in step 1 so that the arc intersects the arc drawn in step 1 twice, once above AB and once below AB. Then construct the perpendicular bisector of segment AB by following the procedure outlined below:  Step 1: With the compass point at A, draw a large arc with a radius greater than ❚B but less than the length of AB so that the arc intersects AB. Geometer’s Sketchpad Resources 2008 NCTM Presentations Archived Presentations Many more activitiesĮxploring Constructions with Geometer’s Sketchpad  G.PS.4c, G.PS.7d, G.RP.5a, G.RP.7a, G.G.28b Use a straightedge to draw a segment and label it AB. Geometer’s Sketchpad Resources Effective Teaching Strategies Key Curriculum Press Website for Educators Workshop Guide with Step-by-Step Instructions Sample Activities Key Curriculum Press (some are free) Mathbits Library of Resources from the Math Forum The New Geometry Strands New York State Virtual Learning System Jefferson Math Project Resources Geometry Strands PDF HTML XLS

Geometer’s Sketchpad and the New Geometry Strands By: David M.