Geometry Vocabulary An acute angle is an angle

less than 90 degrees. Acute Angle Collinear means lying in the

same straight line. Collinear Alternate exterior angles are the two angles

on opposite sides of the transversal but

outside the two lines. Alternate Exterior Angles Consectutive angles are angles that

occur one right after another Consecutive Angles A prism is a solid geometric figure who's

faces are the same and whose sides

are parallellograms

Prism Complimentary angles are

either of two angles whose sum is 90 degrees Complementary Angles A ray is a part of a line that begins at a particular piont and extends endlessly in the other direction Ray A right angle is an angle

that is exactly 90 degrees Right Angle Translation means moving a shape

without rotating, resizing, or

anything else. Translation The median of a triangle is a line segment joining a vertex to the midpoint of the opposing side. Median A triangle is a figure with three

straight sides and three angles. Triangle Conjecture A conjecture is an educated guess or opinion; or a hypothesis. Contra positive means switching the hypothesis and conclusion of a conditional statement and negating both. Contra Positive Converse means switching the hypothesis and conclusion of a conditional statement. Converse Cosine In a right triangle, the cosine of an angle is the length of the adjacent side divided by the length of the hypotenuse. Trigonometry is the branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles. Trigonometry Adjacent angles are angles that are side by side, or adjacent. Adjacent Angles Midpoint The perimeter is the continuous line forming the boundary of a closed geometric figure. Perimeter A cylinder is a solid geometric figure with straight parallel sides and a circular or oval section. Cylinder A point is a location, shown as a dot. Point A polygon is a closes figure formed

by line segments that intersect with two others, or sides. Polygon Corresponding parts are matching parts

of congruent polygons. Corresponding Parts A reflection is a transformation representing the

flip of a figure over a point, line, or plane. Reflection Coplanar Points that lie in the same line are coplanar. A degree is a unit of meaasure used in measuring angles and arcs. Degree Distance is the length os a segment between two points. Distsance A quadrilateral with four right angles. Rectangle A quadrilateral with exactly one pair of parallel sides. Trapezoid The angle between the line of sight and the horizontal when an observer looks upward. Angle of Depression

Sine is the ratio of the measure of the leg opposite the acute angle to the measure of the hypotenuse for an acute angle of a right triangle. Sine An angle is the intersection of two noncollinear

rays at a common endpoint. Angle The group of three whole numbers that satisfies the equation Pythagorean Theorem where c is the greatest number. Theorem is a statement or conjecture that can be proven true by undefined terms, definitions, and postulates. Theorem When the transversal intersects two lines, there are angles that alternate each other on

the inside. Alternate Interior Angles A plane is a flat surface made up of points that has no depth and extends infinitely in all directions Plane Equidistant is when the distance between two lines measured along a perpendicular line is always the same. Equidistant For a nonvertical line containing two points.

m=slope Slope Isosceles Shapes whose opposite sides are

congruent are isosceles. A scalene triangle is a triangle with no congruent sides. Scalene Triangle The vertex is where any two lines

or line segments intersect or meet. Vertex Vertical angles are two nonadjacent angles formed by two intersecting lines. Vertical Angles A conditional statement is a statement that can be written in the "if-then" form. Conditional Statement A rhombus is a quadrilateral with all four sides congruent. Rhombus A proportion is an equation that states that two rations are equal. Proportion The angle of elevation is the angle between the line of site and the horizontal when an observer looks upward. Angle of Elevation Tangent is the point of an intersection of a line and a sphere, called the point of tangency. Tangent A linear pair is a pair of adjacent angles whose non-common sides ore opposite rays. Linear Pair An angle bisector is a ray that divides an angle into two congruent angles. Angle Bisector Diameter The diameter of a circle is a chord that passes through the center of it, or a line segment on a sphere. A polygon can be inscribed in a circle if each of its vertices lie on the circle. Inscribed When the transversal intersects two lines. Corresponding Angles Parallel Parallel lines are coplanar lines that do not intersect. A transversal is a line that intersects two or more lines in a plane at different points. Transversal A cone is a solid with a circular base, a vertex not in the same plane as the base, and a lateral surface area. Cone A polygon for which there is no line that contains both a side of the polygon and a point in the interior of the polygon is the convex. Convex Altitude is a segment from the vertex to the edge. Altitude In a polygon, a segment that connects nonconsecutive vertices of the polygon. Diagonal Parallelogram Parallelograms are quadrilaterals with parallel opposite sides. A square is a quadrilateral with four right angles and four congruent sides. Square 3.14 ... infinity Pi An irrational number represented by the ratio of the circumference of a circle to the diameter of the circle. A point is on the interior of an angle if it does not lie on the angle itself and it lies on a segment with. Interior A line is made up of points, has no thick or thinness, and extends forever in both directions. Line Reasoning that uses a number specific examples to arrive at a plausible generaliziation prediction. Inductive Reasoning The circumference is the distance around a circle. Circumference An obtuse angle is an angle with degree measure greater than 90 and less than 180. Obtuse Angle Perpendicular lines are lines that form right angles. Perpendicular The radius is any segment in a circle or sphere with endpoints that are the center of the circle or sphere and a point on the circle. Randius Secant is any line that intersects a circle in exactly two points. Secant A polygon for which there is a line containing a side of the polygon that also contains a point in the interior of the polygon is concave. Concave Congruent means having the same measure. Congruent Supplementary angles are two angles withj measures that have a sum of 180 degrees. Supplementary Angles Concurrent lines are three or more lines that intersect at a common point. Concurrent Kite A kite is a quadrilateral with exactly two distinct pairs of adjacent congruent sides. Equilateral A polygon or triangle with all sides congruent is an equilateral. A polygon or triangle with all congruent angles is equiangular. Equiangular A point is in the exterior of an angle if it is neither on the angle nor in the interior of the angle. Exterior An example used to show that a given statement is not always true. Counterexample Deductive reasoning is a system of reasoning that uses facts, rules, definitions, or properties to reach logical conclusions. Deductive Reasoning An arc is a part of a circle that is defined by two endpoints. Arc

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# Geometry Vocabulary

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