By CK-12 Foundation

CK-12’s Geometry - moment version is a transparent presentation of the necessities of geometry for the highschool scholar. subject matters contain: Proofs, Triangles, Quadrilaterals, Similarity, Perimeter & sector, quantity, and changes. quantity 1 comprises the 1st 6 chapters: fundamentals of Geometry, Reasoning and evidence, Parallel and Perpendicular traces, Triangles and Congruence, Relationships with Triangles, and Polygons and Quadrilaterals.

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

**Example text**

The angle measure of a straight line. The rays that form this angle are called opposite rays. Right Angle: When an angle measures . Notice the half-square, marking the angle. This marking is always used to mark right, or , angles. Acute Angles: Angles that measure between and . Obtuse Angles: Angles that measure between and . It is important to note that is NOT an acute angle and is NOT an obtuse angle. Additionally, any two lines or line segments can intersect to form four angles. If the two lines intersect to form right angles, we say the lines are perpendicular.

Line C. plane Solution: The surface of a movie screen extends in two dimensions: up and down and left to right. This description most closely resembles a plane, C. Beyond the Basics Now we can use point, line, and plane to define new terms. Space: The set of all points expanding in three dimensions. Think back to the plane. It extended along two different lines: up and down, and side to side. If we add a third direction, we have something that looks like three-dimensional space, or the real-world.

Review Queue Answers Examples could be triangles, squares, rectangles, lines, circles, points, pentagons, stop signs (octagons), boxes (prisms, or dice (cubes). Examples of a plane would be: a desktop, the chalkboard/whiteboard, a piece of paper, a TV screen, window, wall or a door. Factor, Segments and Distance Learning Objectives Understand the ruler postulate. Understand the segment addition postulate. Place line segments on a coordinate grid. Review Queue Answer the following questions. How would you label the following geometric figure?