2 Review What is the formula for the circumference of a circle? C=∏d What is the formula for the area of a circle?A= ∏rWhat does ∏ equal?3.14
3 Solid FiguresBy the end of this lesson you will be able to name solid figures.
4 Vocabulary Polyhedron A three dimensional object, or solid figure, with flat surfaces, called faces, that are polygons.EdgeWhen two faces of a solid figure share a sideVertexA point at which three or more edges meet
5 PracticeHow many faces, edges, and vertices does each figure have?
6 PrismsA Polyhedron with two congruent, parallel bases, and other faces that are all parallelograms.A prism is named for the shape of its base.
7 CylindersHas two congruent, parallel bases, but bases of a cylinder are always circular.
8 PyramidsHas 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.
9 ConesHas a circular base and a curved surface that comes to a point.