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Objectives. Identify, name, and draw points, lines, segments, rays, and planes. Apply basic facts about points, lines, and planes. Vocabulary. undefined term point line plane collinear coplanar segment endpoint ray opposite rays postulate. - _______________________

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## Identify, name, and draw points, lines, segments, rays, and planes.

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**Objectives**Identify, name, and draw points, lines, segments, rays, and planes. Apply basic facts about points, lines, and planes.**Vocabulary**undefined term point line plane collinear coplanar segment endpoint ray opposite rays postulate**- _______________________**The most basic figures in geometry which cannot be defined by using other figures. The undefined terms point, line, and plane are the building blocks of geometry.**K**L M N ____________- Points that lie on the same line. K, L, and M are collinear. K, L, and N are ___________. ____________- Points that lie on the same plane. Otherwise they are ___________.**Example 1: Naming Points, Lines, and Planes**A. Name four coplanar points. B. Name three lines.**Example 1C**Use the diagram to name two planes.**Example 2: Drawing Segments and Rays**Draw and label each of the following. A. a segment with endpoints M and N. B. opposite rays with a common endpoint T.**Example 2C**Draw and label a ray with endpoint M that contains N.**________, or axiom, - a statement that is accepted as true**without proof. Postulates about points, lines, and planes help describe geometric properties.**Example 3A: Identifying Points and Lines in a Plane**Name a line that passes through two points.**Example 3B**Name a plane that contains three noncollinear points.**___________ - the set of all points that two or more figures**have in common.**Example 4: Representing Intersections**A. Sketch two lines intersecting in exactly one point. B. Sketch a figure that shows a line that lies in a plane.**Example 4C**Sketch a figure that shows two lines intersect in one point in a plane, but only one of the lines lies in the plane. 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.

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