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Math Dictionary rCovid19 has led the world to go through a phenomenal transition . Elearning is the future today. Stay Home , Stay Safe and keep learning!!! This page is about Math Dictionary r.R Radian : The angle made by taking the radius and wrapping it along the edge of the circle. One Radian is 180/π degrees, or about 57.296° Radical: The root of a quantity as indicated by the radical sign. Radius: A line segment drawn from the center of a circle to a point on the circle. Random : Without order. Not able to be predicted. Happening by chance. Range (statistics): The difference between the lowest and highest values. Range of a function : The set of all output values of a function. Rate : Rate = distance traveled / time taken. Its unit is either m/s or km/h. Ratio : A ratio shows the relative sizes of two or more values. Ratios can be shown in different ways. Using the ":" to separate example values, or as a single number by dividing one value by the total. Rational Expression : An expression that is the ratio of two polynomials. Rational Number : Any number that can be made by dividing one integer by another. The word comes from "ratio". Ray: Given any two points A and B , AB is equal to the union of AB and all of those points. Real Number : Positive or negative, large or small, whole numbers or decimal numbers are all Real Numbers. Reason: A true statement justifying a step in a proof; the use of logic, examples, etc. to determine a result. Rectangle: A parallelogram containing one right angle; a quadrilateral with four right angles.(from math dictionary r) Rectangular coordinates: An ordered pair of real numbers that establishes the location of a point in a coordinate plane using the distances from two perpendicular intersecting lines called the coordinate axes. (See also Cartesian coordinates.) Rectangular Prism (Cuboid) : A solid (3dimensional) object which has six faces that are rectangles. Recurring Decimal : A decimal number that has digits that repeat forever. Reflection: An isometry where if l is any line and P is any point not on l , then rl (P) = P' where l is the perpendicular bisector of PP' and if P∈l then r _{l} (P) = P . Reflexive property of equality: A property of real numbers that states a = a . Reflex angle : A Reflex Angle is more than 180° but less than 360° Regular polygon : A polygon which is both equilateral and equiangular. Regular pyramid: A pyramid whose base is a regular polygon and whose lateral faces are congruent isosceles triangles. Remote interior angles: Either interior angle of a triangle that is not adjacent to a given exterior angle of the triangle. Also called nonadjacent interior angles. Restricted domain: The domain resulting from a restriction placed on a function, based on the context of the problem. Rhombus: A parallelogram with two adjacent congruent sides; a quadrilateral with four congruent sides. Right angle: An angle formed by two perpendicular lines, the measure of which is 90°. Right circular cylinder: A cylinder whose bases are circles and whose altitude passes through the center of both bases. Right Angle : A right angle is an angle which is equal to 90°, one quarter of a full revolution. Right circular cone: A cone whose base is a circle and whose altitude passes through the center of its base. Right pyramid: A pyramid whose lateral faces are isosceles triangles. Right triangle: A triangle with one right angle. Roman Numerals : How ancient Romans used to write numbers. I, V, X, L, C, D, M are the symbols used. Root : Where a function equals zero. Rotation: An isometry where if P is a fixed point in the plane, θ is any angle and A ≠ P then ' R _{p,θ} (A) = A' where m∠APA' =θ and R _{p,θ} (P) = P Rotational symmetry: A geometric figure has rotational symmetry if the figure is the image of itself under a rotation about a point through any angle whose measure is not a multiple of 360 ^{0} .A regular hexagon has rotational symmetry of 60 ^{0} , 120 ^{0} , 180 ^{0} , 240 ^{0} , and 300 ^{0} (from math dictionary r) Run : How far a line goes along (for a given distance going up). Rise/Run gives you the slope of the line. Math dictionary r From math dictionary r to math dictionary Home Covid19 has affected physical interactions between people. Don't let it affect your learning.
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