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mod 9 vocab
| Question | Answer |
|---|---|
| area | the measure of the interior surface of a two dimensional figure |
| center | the point from which all points on a circle are the same distance |
| circle | the set of all points in a plane that are the same distance from a given point called the center |
| curcumference | the distance around a circle |
| composite figure | a figure that is made up of two or more figures |
| diameter | the distance across a circle through its center |
| face | a flat surface of a polyhedron |
| lateral face | in a polyhedron a face that is not a base |
| pi | the ratio of a circumference of a circle to its diameter the Greek letter "pi" represents this number the value of pi is 3.1415926 approximations for pi are 3.14 and 22 over 7 |
| prism | a polyhedron with two parallel congruent faces called bases |
| pyramid | a polyhedron with one base that is a polygon and three or more triangular faces that meet at a common vertex |
| radius | the distance from the center of a circle to any point on the circle |
| regular pyramid | a pyramid whose base is a regular polyhedron and in which the segment from the vertex to the center of the base is the altitude |
| semicircle | half of a circle the formula for the area of a semi circle is a = one half pi r squared |
| slant height | the height of each lateral face |
| surface area | the sum of the areas of all the surfaces (faces) of a three dimensional figure |
| volume | the number of cubic units needed to fill the space occupied by a solid |
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