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Transcript
Geometry Review Flash Cards A point is like a star in the night sky. However, unlike stars, geometric points have no size. Think of them as being so small that they take up zero amount of space. • A point may be represented by a dot on a piece of paper. • A point is usually named with a capital letter…A A B C Line: Through any two points there exists exactly one LINE. That is … two points define a line. • A “straight” line extends forever in both directions. • The name of a line passing through points A suur and B can be written as “line AB” or as AB . • It may also be referred to as “line BA.” D B A C Endpoints: An endpoint is a point used to define a line segment or ray. Rays: We may think of a ray as a “straight” line that begins at a certain point and extends forever in one direction. • The point where the ray begins is known as its endpoint. • The name of a ray with endpoint A anduuur passing through point B is “ray AB or AB . The arrowhead denotes the direction the ray extends in; there is no arrow head over the endpoint. D B A Geometry Review Flash Cards B A Opposite Rays: Two rays with a common endpoint that form a straight line. C uuur suur uuur BA and BC make AC Collinear Points: Points through which one line can be drawn. Collinear points lie on the same line. B A C D C Non-Collinear Points: Three or more points that do not lie on the same line. A Plane: Can be thought of as a flat surface extending infinitely in all directions. • Through any 3 non-collinear points there exists a plane. • A plane has no thickness. • Planes are usually represented by a shape that looks like a tabletop or a parallelogram. • A plane is named by a single letter (plane m) or by three non-collinear points (plane ABC). Intersecting lines: The term intersect is used when lines, rays, line segments or figures meet, that is, they share a common point (point of intersection). B m C B A D Geometry Review Flash Cards n Perpendicular lines: Two lines that intersect to form right angles (angles that have a measure of 90 degrees). A square at the point of intersection denotes a right angle. We write it with the ⊥ symbol. We say line n is perpendicular to line m; we write it as line n ⊥ line m. m 1 Parallel lines: Two lines in the same plane that never intersect (have no points in common) are called parallel lines. We write is with the ⏐⏐ symbol. We say line 1 is parallel to line 2; we write it as line 1 ⏐⏐ line 2. An angle is formed by two rays with a common endpoint called the vertex of the angle. The rays are called the sides of the angle. • Three letters can be used to name an angles such as ∠ ABC. The middle letter will always denote the vertex of the angle. • An angle can also be named with a number, for example ∠ 1 or ∠ 2. Right angle: An angle whose degree measure is 90. Acute angle: An angle whose degree measure is greater than 0 and less than 90. 2 A B 1 C Geometry Review Flash Cards Obtuse angle: An angle whose degree measure is greater than 90 and less than 180. Straight angle: An angle whose degree measure is 180. Congruent angles: Angles that have the same measure. A linear pair of angles is a pair of adjacent angles who share a common ray and are supplementary. The opposite rays form a straight line. Supplementary angles are two angles whose measures combined equal 180 degrees. Complementary angles are two angles whose measures combined equal 90 degrees. ∠ ABC ≅ ∠ PQR. Geometry Review Flash Cards Adjacent angles: Two angles are adjacent if and only if they share a common side. 2 1 m∠ 1 = m∠ 2 Bisector of an angle: A ray that divides an angle into two congruent angles. 1 2 m∠1 = m∠3 Vertical angles: Whenever two lines intersect to form four angles, the non-adjacent angles are called vertical angles. If two lines intersect, then the vertical angles are congruent. A transversal line intersects two other coplanar lines. We say that transversal line t intersects lines a and b. It forms two types of angles: • Interior angles • Exterior angles m∠2 = m∠ 4 4 1 a b 3 2 t Geometry Review Flash Cards m∠3 = m∠6 If two parallel lines are cut by a transversal, alternate interior angles are congruent. Alternate interior angles are interior angles on the opposite sides of the transversal that do not have a common vertex. m∠4 = m∠ 5 1 2 3 4 5 6 7 8 m∠1 = m∠8 m∠2 = m∠ 7 If two parallel lines are cut by a transversal, alternate exterior angles are congruent. 3 Alternate exterior angles are exterior angles on the opposite sides of the transversal that do not have a common vertex. If two parallel lines are cut by a transversal, corresponding angles are congruent. Corresponding angles: one interior angle and one exterior angle that are on the same side of the transversal and do not have a common vertex. 7 1 2 4 5 6 8 m∠1 = m∠5 m∠3 = m∠7 m∠2 = m∠ 6 m∠4 = m∠ 8 1 2 3 4 7 5 6 8