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Degrees as a unit of angle measure Radian - math word definition Angle definition and properties (Trigonometry) Radical sign or symbol - math word definition Radical sign or symbol - math word definition Radical - math word definition Root (of a number) - math word definition Radical sign or symbol - math word definition Radical - math word definition Radicand - math word definition Root (of a number) - math word definition Radius of an Arc or Arch with calculator - Math Open Reference Derivation of the arc radius formula Circumference (perimeter) of a circle with calculator Parts of a circle - Pictorial index Circumcircle of a Regular Polygon Radius of a Regular Polygon Radius of a circle definition and calculator Semicircle - math word definition Function Range of a function Calculus - Related Rates - a melting snowball Calculus - Ratio Test Ratio - math word definition Triangle similarity, ratios of parts Irrational number - math word definition Number Rational Number - math word definition The fundamental rationale behind Math Open Reference How to construct (draw) a perpendicular at the end of a ray with compass and straightedge or ruler Ray definition (Coordinate Geometry) Opposite Rays Definition Ray - math word definition Complex numbers - animated definition Number Real-number Imaginary-number Ten Reasons why technology is vital to education Reciprocal - math word definition Circumscribed rectangle, bounding box. (Coordinate Geometry) Rectangle and its properties. (Coordinate Geometry) Area and perimeter of a rectangle. (Coordinate Geometry) Rectangle - math word definition with calculator Area of a rectangle with calculator. Definition and formula Rectangles and International paper sizes Diagonals of a rectangle with calculator The Golden Rectangle - math word definition Perimeter of a rectangle with calculator- Math Open Reference Reference angle Reflected Congruent Triangles Reflection - math word definition Reflection - a mirror image of a line segment Reflection - a mirror image of a point Reflex Angle definition Regular Polygon - math word definition Regular polygon area formula Prime number - math word definition Remainder - math word definition Calculus - Volumes of Revolution How to construct (draw) a parallel through a point with compass and straightedge or ruler (rhombus method) Rhombus - math word definition Rhombus area formula with calculator Rhombus diagonals bisect each other at right angles Perimeter of a rhombus Calculus - Midpoint and Trapezoidal Riemann Sums Calculus - Riemann Sums Calculus - Midpoint and Trapezoidal Riemann Sums Calculus - Riemann Sums Right Angle - math word definition Oblique versus right cone - Math Open Reference How to construct (draw) a right triangle with a given one angle and hypotenuse (HA) How to construct (draw) a right triangle with a given leg and hypotenuse (HL) How to construct (draw) a right triangle with a given one angle and one leg (LA) How to construct (draw) a right triangle with two given leg lengths (LL) Normal - math word definition Oblique versus right pyramid - Math Open Reference Pythagorean Theorem - math word definition Right triangle definition How to construct a 90 degree angle with compass and straightedge or ruler Perpendicular - math word definition Radical sign or symbol - math word definition Radical - math word definition Radicand - math word definition Root - math word definition Root (of a number) - math word definition Root (of a polynomial) - math word definition Rotated Congruent Triangles Rotation - math word definition Integer Zero-exponent Rule Construction Constructions Introduction. Drawing shapes with compasses and straightedge List of constructions and construction worksheets