Understanding Points, Understanding Points, 1-1 1-1 Lines, and

Understanding Points, Understanding Points, 1-1 1-1 Lines, and

Understanding Points, Understanding Points, 1-1 1-1 Lines, and Planes Lines, and Planes Warm Up Lesson Presentation Lesson Quiz

Holt HoltMcDougal Geometry McDougalGeometry 1-1 Understanding Points, Lines, and Planes Warm Up Graph each inequality. 1. x 3 -2

0 2 4 2. 2 x 6 0 2

3. x < 1 OR x > 0 0 Holt McDougal Geometry 1 4 6

1-1 Understanding Points, Lines, and Planes Objectives Identify, name, and draw points, lines, segments, rays, and planes. Apply basic facts about points, lines, and planes. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes

Vocabulary undefined term point line plane collinear coplanar segment endpoint ray

opposite rays postulate Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Points that lie on the same line are collinear. K, L, and M are collinear. K, L, and N are

noncollinear. Points that lie on the same plane are coplanar. Otherwise they are noncoplanar. K L M N Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Example 1: Naming Points, Lines, and Planes

A. Name four coplanar points. A, B, C, D B. Name three lines. Possible answer: AE, BE, CE Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Holt McDougal Geometry

1-1 Understanding Points, Lines, and Planes Example 2: Drawing Segments and Rays Draw and label each of the following. A. a segment with endpoints M and N. N M B. opposite rays with a common endpoint T. T

Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Check It Out! Example 2 Draw and label a ray with endpoint M that contains N. M Holt McDougal Geometry

N 1-1 Understanding Points, Lines, and Planes A postulate, or axiom, is a statement that is accepted as true without proof. Postulates about points, lines, and planes help describe geometric properties. Holt McDougal Geometry

1-1 Understanding Points, Lines, and Planes Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Use a dashed line to show the

hidden parts of any figure that you are drawing. A dashed line will indicate the part of the figure that is not seen. Holt McDougal Geometry 1-1 Understanding Points, Lines, and Planes Check It Out! Example 4 Sketch a figure that shows two lines intersect in one point in a plane, but only one of the

lines lies in the plane. Holt McDougal Geometry

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