Geometry Chapter1 Part 3

Service Description

The book is now talking about different "planes" going through each other in a figure they call 1.1. You have on straight up at an angle and another straight across at an angle with several points and "l". The book says, "Figure 1.1 illustrates that lines may lie in different planes or in the same plane. Line "l" and AB both lie in plane Q. Line k and line AB lie in plane P. Lines "l" and "k" are contained in different planes. While line AB", the intersection of the two planes, "is common to both planes. (plane Q . and all connected) /l "We will always as assume <__ . ___/>l that we are working with _ line "l"_ / l_______ figures that lie in the same / / /l / / plane. This branch of / / .B /k / geometry takes a "flat," / / / l / / two-dimensional view of / l . Al / / figures and is referred to as / l / l / / "Plane geometry". "Solid /__________ l/____ /__ P./ geometry" is concerned with figures l / and their spatial relationships as they actually exist in the world l / around us." l / Figure 1.1 l / l/ (Next lesson later)