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A Lénárt sphere is a teaching and educational research model for spherical geometry. The Lénárt sphere is a modern replacement of a "spherical blackboard". It can be used for use in visualizing spherical polygons (especially triangles) showing the relationships between the sides and the angles. == Basic set== The Lenart Sphere Basic Set includes:〔(【引用サイトリンク】url=http://www.cymaths.co.uk/khxc/gbu0-prodshow/Lenart_Sphere.html )〕 * A transparent plastic, eight-inch sphere * A ring-shaped support, called a torus, to place under the sphere * Hemispherical transparencies that fit over the sphere so that students can draw on these with colored markers and cut out shapes with scissors * A spherical ruler with two scaled edges for drawing and measuring arcs, angles, and great circles on the sphere * A spherical compass and center locator for drawing circles on the sphere * A set of transparency markers for writing and drawing on the sphere and transparencies * A hanger for displaying your spherical constructions and designs * A 16-page booklet, Getting Started on the Lenart Sphere, with activities you can begin as soon as you open the box * A four-color polyconic projection of the earth that you can cut out and transform into your own globe 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lénárt sphere」の詳細全文を読む スポンサード リンク
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