Learning and Teaching Geometry, K-12: 1987 Yearbook, Volum 49

ability activities algebra altitude calculus checkerboard circle color computer graphics concept image cone congruent conic consider construct coordinate cube curriculum curve deductive definition diagonals diagram dimensions discussion drawing edges ellipse Euclidean geometry example exercises exterior angles face Find fold formula geoboard geometry course given grade high school hyperbola ideas identify integers interior intersection involve isosceles triangle length line segment logical Logo Mathematics Magazine Mathematics Teacher midpoint Octahedron pair parallel parallelogram pattern blocks patterns perceptual constancy perimeter perpendicular plane polygon polyhedron postulate problem solving Proof without Words properties prove Pythagorean theorem quadrilateral radius rectangle rectangular solids relationships result rhombus right angles right triangle secondary school geometry shapes shown in figure similar solid of revolution solution square statement strategies straws string symmetry task teach tetrahedron theorem trapezoid trianquad understand vertex vertices visual