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Analytic Geometry Vocabulary Cards and Word Walls Important Notes for Teachers: The vocabulary cards in this file reflect the vocabulary students taking Coordinate Algebra will need to know and be able to use. The cards are arranged alphabetically. Each card has three sections. o Section 1 is only the word. This is to be used as a visual aid in spelling and pronunciation. It is also used when students are writing their own “kid-friendly” definition and drawing their own graphic. o Section 2 has the word and a graphic. This graphic is available to be used as a model by the teacher. o Section 3 has the word, a graphic, and a definition. This section can be used for the Word Wall in the classroom. These cards are designed to help all students with math content vocabulary, including ELL, Gifted and Talented, Special Education, and Regular Education students. Addition Rule Addition Rule Addition Rule A method for finding the probability that two events occur; if the two events overlap, the probability of the intersection is added twice, so the intersection needs to be subtracted to compensate for the double addition: ( ) ( ) ( ) ( ) adjacent angles adjacent angles adjacent angles Angles in the same plane that have a common vertex and a common side, but no common interior points adjacent side adjacent side adjacent side In a right triangle, for each acute angle in the interior of the triangle, one ray forming the acute angle contains one of the legs of the triangle and the other ray contains the hypotenuse. This leg on one ray forming the angle is called the adjacent side of the acute angle. alternate exterior angles alternate exterior angles alternate exterior angles Alternate exterior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are outside the other two lines. When the two other lines are parallel, the alternate exterior angles are equal. alternate interior angles alternate interior angles alternate interior angles Alternate interior angles are pairs of angles formed when a third line (a transversal) crosses two other lines. These angles are on opposite sides of the transversal and are in between the other two lines. When the two other lines are parallel, the alternate interior angles are equal. angle angle angle Angles are created by two distinct rays that share a common endpoint (also known as a vertex). ABC or B denote angles with vertex B. angle of depression angle of depression angle of depression The angle below horizontal that an observer must look to see an object that is lower than the observer. Note: The angle of depression is congruent to the angle of elevation. angle of elevation angle of elevation angle of elevation The angle above horizontal that an observer must look to see an object that is higher than the observer. Note: The angle of elevation is congruent to the angle of depression. arc arc arc An unbroken part of a circle Minor arcs have a measure less than 180o. Semi-circles are arcs that measure exactly 180o. Major arcs have a measure greater than 180o. arc length arc length arc length A portion of the circumference of the circle arc measure arc measure arc measure The angle that an arc makes at the center of the circle of which it is a part binomial expression binomial expression binomial expression An algebraic expression with two unlike terms bisector bisector bisector A bisector divides a segment or angle into two equal parts Cavalieri’s Principle Cavalieri’s Principle Cavalieri’s Principle A method of finding the volume of any solid for which cross-sections by parallel planes have equal areas. center (of a circle) center (of a circle) center (of a circle) The point inside the circle that is the same distance from all of the points on the circle central angle central angle central angle Angle Vertex at Center of Circle An angle whose vertex is at the center of a circle and whose sides are radii of the circle centroid centroid centroid The point of concurrency of the medians of a triangle chord chord chord A segment whose endpoints are on a circle circle circle circle A plane figure with all points the same distance from a fixed point called a center ( Standard form: ) ( ) circumcenter circumcenter circumcenter The point of concurrency of the perpendicular bisectors of the sides of a triangle circumscribed circle circumscribed circle circumscribed circle A circle containing an inscribed polygon coincidental coincidental coincidental Two equivalent linear equations overlap when graphed. complement complement complement Given a set A, the complement of A, denoted ̅ or , is the set of elements that are not members of A. complementary angles complementary angles complementary angles Two angles whose sum is 90° are called complementary. Each angle is called the complement of the other. complete factorization complete factorization complete factorization Writing a polynomial as a product of other polynomials that cannot be factored any further completing the square completing the square completing the square Add 2 to complete the square. Completing the square is the process of converting a quadratic equation into a perfect square trinomial by adding or subtracting terms on both sides. complex conjugate complex conjugate complex conjugate A pair of complex numbers, both having the same real part, but with imaginary parts of equal magnitude and opposite signs For example, 3 + 4i and 3 − 4i are complex conjugates. complex number complex number complex number A complex number is the sum of a real number and an imaginary number a + bi where a and b are real numbers and i is the imaginary unit, satisfying i2 = −1. composite figures composite figures composite figures A figure made from two or more geometric figures conditional probability conditional probability conditional probability The probability of an event given that another event has already occurred; Notation: The formula for a conditional probability is congruent congruent congruent Having the same size, shape and measure; two figures are congruent if all of their corresponding measures are equal. conic section conic section conic section A figure formed by the intersection of a plane and a right circular cone; depending on the angle of the plane with respect to the cone, a conic section may be a circle, an ellipse, a parabola, or a hyperbola corresponding angles corresponding angles corresponding angles Angles that have the same relative positions in geometric figures corresponding sides corresponding sides corresponding sides Sides that have the same relative positions in geometric figures dependent events dependent events dependent events Two or more events in which the outcome of one event affects the outcome of the other event or events diameter diameter diameter The distance across a circle through its center; the line segment that includes the center and whose endpoints lie on the circle difference of squares difference of squares difference of squares A perfect square subtract another perfect square For example: dilation dilation dilation Transformation that changes the size of a figure, but not the shape discriminant discriminant discriminant The discriminant of a quadratic equation of the form ax2 + bx+ c = 0, a 0, is the number b2 – 4ac element element element A member or item in a set endpoints endpoints endpoints The points at an end of a line segment equiangular equiangular equiangular The property of a polygon whose angles are all congruent equilateral equilateral equilateral The property of a polygon whose sides are all congruent. exponential function exponential function exponential function A function of the form y = a·bx where a > 0 and either 0 < b < 1 or b > 1. expression expression expression A mathematical phrase involving at least one variable and sometimes numbers and operation symbols exterior angle of a polygon exterior angles of a polygon exterior angles of a polygon An angle that forms a linear pair with one of the angles of the polygon focus of a parabola focus of a parabola focus of a parabola Every point on a parabola is equidistant from a fixed point (called the focus) and a fixed line (called the directrix) general form (of equation of a circle) general form (of equation of a circle) general form (of equation of a circle) Found by expanding the standard form of the equation of a circle: square the two binomials combine like terms and set the equation equal to zero horizontal shift horizontal shift horizontal shift A rigid transformation of a graph in a horizontal direction, either left or right incenter incenter incenter The point of concurrency of the bisectors of the angles of a triangle independent events independent events independent events Events whose outcomes do not influence each other inscribed inscribed inscribed An inscribed planar shape or solid is one that is enclosed by and "fits snugly" inside another geometric shape or solid. inscribed angle inscribed angle inscribed angle An angle whose vertex is on the circle and whose sides contain chords of a circle inscribed circle inscribed circle inscribed circle A circle enclosed in a polygon, where every side of the polygon is a tangent to the circle; specifically for this unit the polygon will be a triangle and so the center of the inscribed circle is the incenter of the triangle inscribed polygon inscribed polygon inscribed polygon A polygon is inscribed in a circle if and only if each of its vertices lie on the circle. intersecting lines intersecting lines intersecting lines Two lines in a plane that cross each other. Unless two lines are coincidental, parallel, or skew, they will intersect at one point. intersection intersection intersection The point at which two or more lines intersect or cross intersection of sets intersection of sets intersection of sets The set of all elements contained in all of the given sets Notation: lateral area lateral area lateral area The sum of the areas of the lateral faces of a cylinder, cone, etc. line line One of the basic undefined terms of geometry line Traditionally thought of as a set of points that has no thickness but its length goes on forever in two opposite directions. line segment line segment line segment The part of a line between two points on the line. ̅̅̅̅ denotes a line segment between the points A and B. linear pair linear pair linear pair Adjacent, supplementary angles; excluding their common side, a linear pair forms a straight line.