Geometry+Wikispace++Assignment

Definitions of Words:

Prism-A solid object that has two identical ends and all flat sides. Base-The surface that a solid object stands on. Face-A Face is a flat surface of a three-dimensional figure. Lateral Face-The faces that join the bases of a solid are called Lateral Faces. Edge-The line where two surfaces meet. Surface Area-The total area of the surface of a three-dimensional object Right Prism-a prism that has two bases, one directly above the other, and that has its lateral faces as rectangles. Oblique Prism-A prism in which the bases are not aligned properly is called an Oblique Prism. Lateral Area-the sum of the surface areas of all its faces excluding the base of the solid. Pyramid-A pyramid is a polyhedron with a polygonal base and triangles for sides Regular Pyramid-a right pyramid whose base is a regular polygon. Vertex of a Pyramid-A point on a pyramid where all the faces excluding the base meet. Altitude of a Pyramid-Altitude of a geometric figure is the shortest distance from its top (vertex) to its opposite side (base).

Net- A pattern that you can cut and fold to make a model of a solid shape.

Formulas

Pyramid-(b*h)/3 Cylinder-PI x r^2 x h Cone-(b*h)/3 Sphere-(4/3) * PI * r^3 Surface Area of a Pyramid-1/2perimeter x slant height + B Surface Area of a Cylinder-s= 2(pi)(r2) + (2)(pi)(r)(h) Surface Area of a Cone-Pie*r*s+Pie*r^2 Surface Area of a Sphere-4*3.14*r(squered)/3

Describing Each Shape including how many faces, edges, and vertices they have

Tetrahedron-4 faces, 6 edges, 4 vertices Cube-**A cube has 6 faces, 8 vertices, and 12 edges.** Octahedron-8 faces 6 vertices and 12 edges Icosahedron-30 edges 12 vertices 20 triangular faces. Dodecahedron-12 face, 30 edges, 20 vertices