Students distinguish between points, lines, line segments, rays, angles, and polygons. They explore the software entitled Geometer's Sketchpad in order to do so. They determine how lengths of a polygon are related to the perimeter.
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Proving Slope Criteria for Parallel & Perpendicular Lines
This lesson plan launches with learners graphing the fourth vertex of a given rectangle, and finding the length and slope of one of its sides; and ends with learners writing a summary sheet for parallel and perpendicular lines. In...
7th - 11th Math CCSS: Designed
Discovering the Formula for the Area of a Triangle
Most high schoolers are very familiar with the area of the triangle being equal to 1/2 base times the height. Here, they will develop and test their formula for the area of a triangle when given two adjacent sides and the included angle....
9th - 11th Math CCSS: Designed
Investigating the Relationship Between the Inscribed Angle and Central Angle
This is a fun lesson plan that explores the relationship between inscribed angles and central angles in the same circle. Learners use dynamic geometry software such as GeoGebra, Geometer's Sketchpad, or Cabri to construct and measure...
9th - 12th Math CCSS: Designed
Interior/Exterior Polygon Angles and Tessellations
Students discover the sum of the interior and exterior angles of several polygons. In this Geometers sketchpad instructional activity, students work in groups to find the stated measurements of triangles, quadrilaterals, pentagons and...
9th - 11th Math
Exploring Transformations with Geometer's Sketchpad
Clearly written, step-by-step guided practice in creating a figure and performing a transformation with the award-winning Geometer's Sketchpad software makes up the first three pages of this resource. Questions ask for explanations of...
9th - 12th Math