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33 Cards in this Set

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 Solid Is a 3 dimensional object. Faces A flat surface on a solid. Polyhedrons A solid whose faces are polygons. Edges A segment joining two faces of a polyhedron. Vertices Corners of a solid. Prism A polyhedron whose bases are congruent and parallel. Example: rectangular prism (flat side lunch box pyramid A polyhedron with one polygonal base. Example: The egyptian pyramids have a square base. (Square Pyramid) Describe a pentagonal pyramid. Number of faces: Number of edges: Number of vertices: Number of faces: 6 Number of edges: 10 Number of vertices: 6 Describe a pentagonal prism. Number of faces: Number of edges: Number of vertices: Number of faces: 7 Number of edges: 15 Number of vertices: 10 surface area (for a solid) The sum of the areas of its surfaces. What is the best way to find the surface area of a solid? Drawing a net. Allows you to see all the shapes and dimensions of its faces. Then you just use the area formulas to help you calculate the sufrace area. Volume (three dimensional object) The amount of space the object takes up. Volume is always measured in? Cubic units Just need to count up number of cubes an object can hold. What is the volume of a rectangular prism with a lenght of 10 in, a width of 5 in, and a height of 10 in? Answer: 500 cubic inches or 500 in³ Circle A plane figure whose points are all the same distance from its center. Center The point in the exact middle of a circle or sphere. central angle An angle whose vertex is at the center of a circle. Pi The ratio of a circle's circumference to its diameter. Value = 3.14159265... diameter The distance across a circle through its center. radius The distance from the center of the circle to a point on the circle. Circumference The perimeter of a circle. Ex. The distance around your pool. Formula for Circumference C = 3.14159265 x diameter Find the circumference of a circle whose radius is 5 cm.(Use 3.14) Answer: 3.14 x 10 = 31.4 cm Find the circumference of a circle whose radius is 5 cm.(Use 3.14) Answer: 3.14 x 10 = 31.4 cm What is the formula for area of a circle? Area = pi x radius squared = 3.14 x r² Find the area of a circle with a radius of 10 cm. Area = 3.14 x 10² Area = 314 cm2 All faces of polyhedrons are flat. True or False True cylinder A solid with two parallel circular bases with the same radius. cone A solid with one circular base. sphere Is a solid version of a circle. (ball) All the points on a sphere ae the same distance from its center. The net of of cylinder always has what 3 figures to measure? 2 circles and 1 rectangle What is the formula for the volume of a cylinder? V = Bh B = pi x radius squared h = height 3.14 x r² x height = ____ units³ What is the volume of a cylinder with a radius of 3ft and the height 5ft? (Round to the nearest tenth) Answer: 141.3 ft V = 3.14 x 3² x 5³