Informal Geometry Explorations
More than 75 motivational problem-solving activities explore geometry in the natural and human worlds: counting, area, construction, congruence, visualization, symmetry, tiling, and dissection. These versatile problems introduce new topics, reinforce and review ideas, or simply serve as a change of pace. Blackline masters and answer key.
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angle apothem backcourt centimeters Challenge complete the table concave polygon congruent equilateral triangles congruent regions congruent right triangles congruent triangles copies deltahedron diagonal different-size triangles Dissection envelope floral clock golden ratio golden triangles hexomino shapes Informal Geometry interior points intersection points isometric dot paper least number line of symmetry line segment maximum number minimum surface area number of intersection number of lines number of segments number of toothpicks number of triangles nx nwhen pentomino shapes Perimeter of original Perimeter of square Pick's Rule points of intersection rectangle rectangular pieces regular hexagon Regular polygons rhombus Select any point separate sheets service court shaded sheets of paper side total sketch sq ft square feet square miles square region square units table to predict tangram tape three congruent threesomes toothpicks needed total number tracing paper trapezoids triangles per side tromino shape turn symmetry unit cubes vertices Visualization XXX XXX