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Published byChristopher Spencer Modified over 9 years ago
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Geometric Solids
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How Can You Describe a Three- Dimensional Figure? Solid figures are also called three-dimensional figures. You can describe many three- dimensional figures by counting the number of faces, edges, and vertices they have.
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Faces, Edges, and Vertices A face of a solid figure is a flat surface in the shape of a polygon. An edge of a solid figure is a line segment where two faces meet. A vertex of a solid figure is the point where three or more edges meet. The term vertices refers to more than one vertex.
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These are some 3-D figures you should be able to recognize and describe.
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Triangular Prism 5 faces (2 triangular, 3 rectangular) 9 edges 6 vertices
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Rectangular Prism 6 rectangular faces 12 edges 8 vertices
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Cube 6 square faces 12 edges 8 vertices
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Triangular Pyramid 4 triangular faces 6 edges 4 vertices
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Square Pyramid 5 faces (1 square, 4 triangular) 8 edges 5 vertices
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Curved Surfaces Some three-dimensional figures have a curved surface. Some of these figures also have one or two circular surfaces called bases.
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Here are some three-dimensional figures with curved surfaces that you should be able to recognize and describe.
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Cylinder 1 curved surface 2 circular bases
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Cone 1 curved surface 1 circular base 1 vertex
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Sphere 1 curved surface
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Quiz Use your response pad to answer these questions.
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This shape is called a cone. The arrow is pointing to the cone’s ___. A.vertex B.plane C.base D.edge
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This block is in the shape of a cube. The arrow is point to the cube’s ______. A.edge B.face C.vertex D.base
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The refrigerator has the shape of a rectangular prism. The arrow is pointing to the _____ of the rectangular prism. A.base B.vertex C.edge D.face
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The arrow is pointing to the ____ of the figure. A.edge B.face C.vertex D.base
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Name the figure. A.pyramid B.cone C.cylinder D.prism
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Name the figure. A.cylinder B.cube C.cone D.sphere
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This toy has the shape of a ___. A.cone B.square pyramid C.triangular prism D.cube
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How many faces? A.12 B.4 C.6 D.8
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How many edges does this figure have? What is the name of the figure? A.8, rectangular prism B.5, rectangular prism C.8, square pyramid D.5, square pyramid
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