Radian
Radical
Radicand
Radius
Radius (polygon)
Radix
Random
Random Sample
Range (statistics)
Range of a function
Rate of return
Ratio
Rational Expression
Rational Function
Rational Number
Ray
Real Number
Real Numbers
Reciprocal
Rectangle
Rectangular Prism
Recurring Decimal
Recursive
Reduce
Reflection
Reflection Symmetry
Reflex Angle
Regular Polygon
Regular Polyhedron
Relative Frequency
Relatively Prime
Remainder
Rent
Repeating Decimal
Revolution
Rhombus
Right Angle
Right Triangle
Right-Angled Triangle
Rigid
Rise
Risk
Risk management
Roman Numerals
Root
Rotation
Rotational Symmetry
Rounding
Row
Rule of 72
Ruler
Run
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