Cube : A cube is a three-dimensional shape with 6 faces that are all squares. A cube has 8 corners and 12 edges.

Line : A line AB is a one-dimensional shape that includes the points A and B, all the points on the line segment in between A and B and all the points of the straight extension of the line segment beyond A and B. A line does not have an endpoint.

Shape : A shape is a set of points in space.

Three-dimensional shape : A three-dimensional shape is a shape that has a volume.

Triangle : A triangle is a polygon with three corners and three sides. You can calculate the area of a triangle by multiplying half the length of the base by the height on that base. The sum of the interior angles in a triangle is always $180^{\circ}.$

Volume : Volume refers to the size of a three-dimensional objects measured by how many unit cubes it would take to fill the shape.

Centimeter : A centimeter ($cm$) is $\frac{1}{100}$ of a meter.

Length : Length is the attribute of a one-dimensional shape that can be measured with a measuring tape.

Perimeter : The perimeter of a two-dimensional shape is the length of the boundary of the shape. For a polygon this is the same as the sum of all the side lengths. For example a triangle with side lengths 1, 2 and 3cm has a perimeter of 1+2+3=6cm. The perimeter of a circle is referred to as its circumference.

Square : A square is a quadrilateral with four right angles and four equal length sides. A square is a special case of a rectangle and a special case of a rhombus.

Sum : A sum is the result of an addition.

Average : The average or arithmetic mean of numbers $x_1, x_2,\ldots, x_N$ is defined as $\frac{1}{N}(x_1+x_2+\ldots+x_N).$ For example the average of 1 and 2 is $\frac{1}{2}(1+2)=1.5$ and the average of 1, 4 and 10 is $\frac{1}{3}(1+4+10)=5.$

Box plot : A way to visualize data. The left end of the box plot coincides with the minimum of the data. Similar the right end of the box plot visualizes the maximum of the data. The left and right end of the box in the box plot correspond to the 25th and 75th quantile of the data and the line in the box represents the median of the data.

Line : A line AB is a one-dimensional shape that includes the points A and B, all the points on the line segment in between A and B and all the points of the straight extension of the line segment beyond A and B. A line does not have an endpoint.

Maximum : The maximum of a set of numbers is the highest of the numbers in the set. A function has a maximum at $x_0$ if $f(x_0)\geq f(x)$ for all $x.$

Median : The median of n numbers is defined as the $\frac{n}{2}$-th biggest number in case of even $n$ and as the average of the $\frac{n-1}{2}$-th biggest number and the $\frac{n+1}{2}$-th biggest number in case of odd $n.$ The median of numbers is a statistic that can be representative of a typical element of a collection of numbers. It is an alternative to the average of numbers.

Minimum : The minimum of a set of numbers is the lowest of the numbers in the set. A function has a minimum at $x_0$ if $f(x_0)\leq f(x)$ for all $x.$