Summary of Key Terms

Acute angle - any angle less than 90 degrees.
Angle - a measure of space between two intersecting lines.
Arithmetic mean - sum of all the items divided by the number of items.
Bearing - a measure of location on a compass.
Circumference - boundary or perimeter of a circle.
Correlation - a mutual connection between two variables.
Denominator - the bottom part of a fraction. Hint: it is down under the numerator.
Diameter - distance across a circle through the centre giving its width.
Factor - a number that divides exactly into another number.
Gradient - the steepness of the slope of a line.
Hypotenuse - the longest side of a right-angled triangle.
Improper fraction - a fraction having the numerator higher than the denominator.
Modulo - a remainder value when two numbers are divided. The modulo function is given as a mod b, where a and b are two numbers. For example 16 divided by 3 gives 5 remainder 1, which can be expressed as 16 mod 3 = 1.
Negative number - having a value less than one.
Numerator - the top part of a fraction.
Obtuse - any angle greater than 90 but less than 180 degrees.
Percentage - a fraction multiplied by 100.
Perimeter - the total distance around the boundary of a shape.
Perpendicular - a line at right angles to another line.
Prime number - having only two factors of different values.
Polygon - a many-sided shape.
Quadrilateral - a plane four-sided shape.
Quotient - the result of dividing one number by another. Quotient comes from Latin and means "how many times".
Radius - half the diameter of a circle.
Reflex angle - any angle greater than 180 degrees.
Transcendental number - has a value that cannot be calculated by any combination of addition, subtraction, multiplication, division, or square root extraction such as pi.

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