# Geometry_Definitions_3-D_figures.txt

 sphere set of points in space a fixed distance (radius) from a certain point (center) great circle points of intersection b/w a plane & the center circle of a sphere small circle any circle on a plan that is not a great circle conic solid given a region (base) & a point (vertex) not in the plane of the region, a conic solid is the set of points b/w the vertex & all points of the base, tog. w/ the vertex & base cone surface of a conic solid whose base is a circle pyramid surface of a conic solid whose base is a polygon height (altitude) of a pyramid/cone distance from the vertex to the nearest point of the base on that surface Slant height of a pyramid is...(finish sen.; NOT def) always shorter than the edge of the lateral surface Slant height of a lateral surface of a pyramid/cone distance from the vertex to the nearest point of the base on that surface Definition of a plane section of a 3-D figure intersection of that figure w/ a plane elevation a view of the front, side, or back of a 3-D figure such as a house or building plan a bird's eye view of a 3-D figure net 2-D figure that can be folded into a 3-D figure Point-Line-Plane Postulate (7 parts) given a line in a plane, there exists a point in the plane not in the line. Given a plane in space there exists a point in space not on the planeevery line is a set of points that can be put into a one-to-one correspondence w/ the real #s, w/ any point on it corresponding to 0 & any other point corresponding to 1through any two points, there is exactly one lineif two points lie in a plane, the line b/w them lies in the planeon a number line, there is a unique distance b/w two pointsthrough 3 non-collinear points (points that are not on the same line), there is exactly one plane.if 2 different planes have a point in common, then their intersection is a line a line is perpendicular to a plane when... (2) a line (L) is perpendicular to a plane (X) if and only if it is perpendicular to every line in X through their intersection ORif the measureof an angle b/w a line and a plane is 90 degrees it is perpendicular to the plane Can a line which is not in a plane be perpendicular to a line in the plane? Explain. Yes. Every line oblique to a plane forms a right angle w/ exactly one line in the plane. How many possible intersection points are there of two non-parallel planes? Explain. Undefined or indeterminable, the answer is a number that cannot be measured. Authorghstechnology ID82461 Card SetGeometry_Definitions_3-D_figures.txt Descriptiongeometry Updated2011-04-28T12:32:31Z Show Answers