1.1 Key Concepts.

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Transcripción de la presentación:

1.1 Key Concepts

Undefined Terms Palabras que no tienen definiciones formales pero hay un acuerdo sobre lo que significan.

Point (un punto) Un punto es el componente más básico de la geometría. No tiene ningún tamaño. Sólo tiene lugar. Representa un punto con un punto, y lo que sea con una letra mayúscula.

Line (una linea) Una línea es una disposición recta, continua de infinitamente muchos puntos. Tiene longitud infinita pero no espesor. Se extiende para siempre en ambas direcciones.

Plane (un plano) Un plano tiene longitud y anchura pero no espesor. Se extiende infinitamente a lo largo de su longitud y anchura. Un plano se representa por lo menos 3 puntos, o por una letra mayúscula cursiva.

Collinear Points Collinear – en la misma línea

Coplanar Points Coplaner – en la misma plano

Defined Terms Términos que pueden ser descritos con términos conocidos como punto o línea

Segment (segmento) LÍNEA segmento (segmento) – consiste en dos extremos y todos los puntos en el medio.

Ray RAY – una línea que comienza en un punto y va infinitamente la otra dirección.

Opposite Ray

Intersection Intersectar (Intersect) – dos o más figuras geométricas se intersecan si tienen uno o más puntos en común.

EXAMPLE 1 Name points, lines, and planes a. Give two other names for PQ and for plane R. b. Name three points that are collinear. Name four points that are coplanar. SOLUTION Other names for PQ are QP and line n. Other names for plane R are plane SVT and plane PTV.

EXAMPLE 1 Name points, lines, and planes b. Points S, P, and T lie on the same line, so they are collinear. Points S, P, T,and V lie in the same plane, so they are coplanar.

GUIDED PRACTICE for Example 1 1. Use the diagram in Example 1. Give two other names for ST . Name a point that is not coplanar with points Q, S, and T. ANSWER TS, PT; point V

EXAMPLE 2 Name segments, rays, and opposite rays a. Give another name for GH . b. Name all rays with endpoint J . Which of these rays are opposite rays? SOLUTION a. Another name for GH is HG . b. The rays with endpoint J are JE , JG , JF , and JH . The pairs of opposite rays with endpoint J are JE and JF , and JG and JH .

GUIDED PRACTICE for Example 2 2. Give another name for EF ANSWER FE 3. Are HJ and JH the same ray ? Are HJ and HG the same ray? Explain. ANSWER No; the rays have different endpoints. Yes; points J and G lie on the same side of H.

EXAMPLE 3 Sketch intersections of lines and planes a. Sketch a plane and a line that is in the plane. b. Sketch a plane and a line that does not intersect the plane. c. Sketch a plane and a line that intersects the plane at a point. SOLUTION a. b. c.

EXAMPLE 4 Sketch intersections of planes Sketch two planes that intersect in a line. Draw: a vertical plane. Shade the plane. STEP 1 SOLUTION Draw: a second plane that is horizontal. Shade this plane a different color. Use dashed lines to show where one plane is hidden. STEP 2 Draw: the line of intersection. STEP 3

GUIDED PRACTICE for Examples 3 and 4 Sketch two different lines that intersect a plane at the same point. ANSWER Use the diagram at the right. 5. Name the intersection of PQ and line k. ANSWER Point M

GUIDED PRACTICE for Examples 3 and 4 6. Name the intersection of plane A and plane B. ANSWER Line k 7. Name the intersection of line k and plane A. ANSWER Line k Use the diagram at the right.