Geometry Chapter 1 part 7

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This the 7th part of this chapter and because it is only of the second example, they give Grandma has decided to start the explanation of the chapters middle picture of 6 here if necessary. In this other example (for the impaired it shows a plane slanted a little with one corner marked as A (the 'vertex') with a 1 also a side going to B corner with a diagonal line to the opposite corner of D which can also be called a 'vertex 'a 2 with it but that diagonal line also has a letter E on it and a 3. B also has a line that goes to a right angle or corner C that connect downward to the corner angle or 'vertex' D. However, between B and C is another point M that goes downward and through BED line with a point and probably another 'vertex' L also marked with a 4. The problem asks to "Use three letters to name each of the numbered angles in the accompanying diagram." Solution with the funny x's or triangles _1=_BAD or _DAB or _LAB _2=_CDB or _BDC (Note Letter E may be used instead of B.) _3=_BEM or _MEB _4=_DLM or _MLD Note Letter E may be used instead of letter M.) The next page (5) that will show on the next lesson Rest of Geometry's Chapter1, will start Definitions and Postulates 'Definitions'-"The purpose of a 'definition is to make the meaning of a term clear. A good 'definition must:" "Clearly identify the word (or expression) that is being defined." "State the distinguishing characteristics of the term being defined, using only words that are commonly understood or that have been previously defined." "Be expressed in a grammatically correct sentence. As an example, consider the term 'collinear.'" they are showing and using two Figures 1.5 and 1.6. 1.5 shows a side or diagonal line with both ends having arrows and Points ABC are marked on the line. It is considered to be 'collinear. Figure 1.6 shows another line downward or diagonal from point R to point T. The line has arrows on both ends but there is a separate point S just lying in space not on a line. The Professor goes on to explain "DEFINITIONS OF COLLINEAR AND NONCOLLINEAR POINTS" "'Collinear points' are points that lie on the same line." "'Noncollinear points' are points that do not lie on the same line." (Grandma will go to the ending lesson with the picture to start ending the Chapter but she will use parts to continue it