A name given to the angle which measures exactly 90 degrees.
Category Archives: R
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Rhombus
A quadrilateral with 4 equal sides and two sets of equal angles.
Reverse Percentage
Working out the original amount from an increased or decreased value.
Representative
Represents the whole group.
Remainder
A number which cannot be divided by a divisor.
Regular Polygon
Rectangle
A quadrilateral with 2 sets of equal parallel sides and 4 right angles.
Key Rectangle Topics: Area and Perimeter.
Rationalise the Denominator
Make the denominator an integer. This is used in the topic of Surds, where they want the answer without a surd in the denominator.
Rational number
A number which can be calculated by dividing two integers. All fractions are rational numbers.