By CK-12 Foundation

CK-12’s Geometry - moment variation is a transparent presentation of the necessities of geometry for the highschool pupil. subject matters contain: Proofs, Triangles, Quadrilaterals, Similarity, Perimeter & region, quantity, and changes. quantity 1 contains the 1st 6 chapters: fundamentals of Geometry, Reasoning and facts, Parallel and Perpendicular strains, Triangles and Congruence, Relationships with Triangles, and Polygons and Quadrilaterals.

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**Extra info for CK-12 Geometry - Second Edition, Volume 1 of 2**

**Example text**

Know What? Revisited If you take the triangles and move them so that the point that met at the center of the square was on the outside, you would get the figure at the right. However, you could also argue that this is not a shape because it has a square hole in the center of it. Another shape that can be made from the four triangles is a rectangle. Part of geometry is justifying and explaining reasoning. You could reason that both of these answers are acceptable. Review Questions For questions 1-5, draw and label an image to fit the descriptions.

B. Congruent Linear pairs add up to _______. — C. Angle Bisector The in from of . — D. Ray What you use to measure an angle. — E. Collinear When two sides of a triangle are congruent. — F. Perpendicular — G. Line A line that passes through the midpoint of another line. — H. Protractor An angle that is greater than . — I. Segment Addition Postulate The intersection of two planes is a ___________. — J. Obtuse — K. Point An exact location in space. — L. A sunbeam, for example. — M. Isosceles Every angle has exactly one.

Hexagon — P. Bisector Texas Instruments Resources In the CK-12 Texas Instruments Geometry FlexBook, there are graphing calculator activities designed to supplement the objectives for some of the lessons in this chapter. org/flexr/chapter/9686. Chapter 2: Reasoning and Proof This chapter explains how to reason and how to use reasoning to prove theorems about angle pairs and segments. This chapter also introduces the properties of congruence, which will also be used in proofs. Subsequent chapters will combine what you have learned in Chapters 1 and 2 and build upon them.