# Dual Bar Chart

A bar chart where each category has two bars instead of one. This is used when two frequencies exist for a category. This type of graph allows for comparisons to be made between the two sets of values.

# Describe fully

A command word that, when used in transformation questions is asking for:

If it is a reflection: A reflection in the line….(and then the equation of the mirror line)
If it is a translation: A translation by the vector…. (giving the vector). You may also say ‘A translation by ___ to the right and ___ up’.
If a rotation: A rotation _______(give clockwise/ anticlockwise) by _____(give the angle) about the centre _____ (give the coordinate of the centre).
In an enlargement: An enlargement of scale factor ____(give the scale factor) about the centre ___(give the centre of enlargement).

# Diameter

The distance between two points on the circumference of a circle, passing through the centre. It is equivalent to 2 lots of the radius.

Example:

🔑 Key Diameter Topics: Parts of a CircleArea of a CircleCircumference of a CircleCircle Theorems
👀Also Look Up: Circle, RadiusSector

# Divisor

The number which divides another. It is the second number in a division question.

Example: 6 is the divisor in the sum 24 ÷ 6.

🔑 Key Divisor Topics: Division, Factors, HCF

# Divisible

Can be divided by something without a remainder.

Example: 24 is divisible by 1, 2, 3, 4, 6, 8, 12 and 24.

🔑 Key Divisible Topics: Factors, HCF

# Direct Proportion

Where two values are linked by a common multiple. The key feature is that when you have none of one, you have none of the other.

Example: x and y are in direct proportion.

🔑 Key Direct Proportion Topics: Direct and Inverse Proportion

# Difference

Another way of asking you to subtract two numbers.

Example: Find the difference of 8 and 17.

🔑 Key Difference Topics: Subtraction, Negative Numbers