By CK-12 Foundation

CK-12’s Geometry - moment version is a transparent presentation of the necessities of geometry for the highschool scholar. issues comprise: Proofs, Triangles, Quadrilaterals, Similarity, Perimeter & quarter, quantity, and alterations. quantity 1 comprises 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 resources for CK-12 Geometry - Second Edition, Volume 1 of 2**

**Example text**

Two intersecting planes, and , with where is in plane and is in plane . Four non-collinear points, and , with line segments connecting all points to each other. Name this line in five ways. Name the geometric figure below in two different ways. Draw three ways three different planes can (or cannot) intersect. What type of geometric object is made by the intersection of a sphere (a ball) and a plane? Draw your answer. For 10-13, use geometric notation to explain each picture in as much detail as possible.

First, draw a straight line, about 2 inches long, and place an endpoint at one end. With the point (non-pencil side) of the compass on the vertex, draw an arc that passes through both sides of the angle. Repeat this arc with the line we drew in #1. Move the point of the compass to the horizontal side of the angle we are copying. Place the point where the arc intersects this side. Open (or close) the “mouth” of the compass so you can draw an arc that intersects the other side of the arc drawn in #2.

This angle measures . Classifying Angles By looking at the protractor we measure angles from to . Angles can be classified, or grouped, into four different categories. Straight Angle: When an angle measures . 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 .