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Lesson 10-6 Solid Figures

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**Review What is the formula for the circumference of a circle? C=∏d**

What is the formula for the area of a circle? A= ∏r What does ∏ equal? 3.14

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Solid Figures By the end of this lesson you will be able to name solid figures.

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**Vocabulary Polyhedron**

A three dimensional object, or solid figure, with flat surfaces, called faces, that are polygons. Edge When two faces of a solid figure share a side Vertex A point at which three or more edges meet

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Practice How many faces, edges, and vertices does each figure have?

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Prisms A Polyhedron with two congruent, parallel bases, and other faces that are all parallelograms. A prism is named for the shape of its base.

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Cylinders Has two congruent, parallel bases, but bases of a cylinder are always circular.

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Pyramids Has one polygon shaped base, and the other faces are triangles that come to a point. A pyramid is named for the shape of its base.

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Cones Has a circular base and a curved surface that comes to a point.

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