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.

# 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.