Table of Contents

Below are common math words that start with r.

- Ratio
- Rational
- Real numbers
- Radical
- Rectangle
- Rotation
- Reflection
- Regression
- Range
- Radius
- Root
- Radian
- Rectangle theorem
- Reciprocal
- Rational number
- Rationalize
- Right angle
- Rhombus
- Radical expression
- Rotation matrix
- Reflection symmetry
- Rational function
- Range of a function
- Rational equation
- Radius of convergence
- Regression analysis
- Rational inequality
- Right triangle
- Riemann sum
- Radius of curvature
- Rounding
- Recursive
- Relative frequency
- Regular polygon
- Rational root theorem
- Remainder theorem
- Rectangular prism
- Range rule
- Reflectional symmetry
- Riemann hypothesis
- Random variable
- Rational exponent
- Rational approximation
- Rotation symmetry
- Rate of change
- Recurrence relation
- Radius of a circle
- Regression line
- Ray

**Radius:**Distance from the center of the circle to its edge.**Rectangle:**Quadrilateral with four right angles.**Rhombus:**Quadrilateral with equal sides but not right angles.**Rotation:**Circular movement around a fixed point.**Reflection:**Transformation flipping shape across a line.**Radian:**Unit of angular measurement in a circle.**Regular Polygon:**Polygon with all sides and angles equal.**Right Angle:**Angle measuring 90 degrees.**Radius of Curvature:**Radius of the circle approximating the curve at a point.**Riemann Surface:**Complex surface mapping to the complex plane.

**Rational Number:**A number expressible as a fraction of integers.**Radical:**Symbol (√) representing a root of a number.**Range:**Set of output values in a function.**Ratio:**Comparison of two quantities using division.**Reciprocal:**Multiplicative inverse of a number (1/x).**Reflexive Property:**Element is related to itself in a relation.**Regression Analysis:**Statistical method to model relationships between variables.**Rotation:**Turning a shape around a fixed point.**Roots of Equation:**Solutions that make the equation true.**Radian:**Unit for measuring angles based on the radius of a circle.

**Explore Other Math Words:**