![]() Write a proof that ray BF bisects ∠ABC.Įxploring Constructions with Geometer’s Sketchpad G.G.20a Construct an equilateral triangle with sides of length b and justify your work.Įxploring Constructions with Geometer’s Sketchpad G.RP.3e, G.RP.5c, G.CM.5e Construct an angle of 300 and justify your construction.Įxploring Constructions with Geometer’s Sketchpad G.R.1b, G.R.3a, G.R.5a, G.G.30a Using a dynamic geometry system draw ΔABC similar to the one below. Step 2: With the compass point at D and then at E, draw two arcs with the same radius that intersect in the interior of ∠ABC. ![]() 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.
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