EQUATION:An equation is a mathematical sentence that has two equal sides separated by an equal sign. 4 + 6 = 10 is an example of an equation. We can see on the left side of the equal sign, 4 + 6, and on the right hand side of the equal sign, 10. Example: 3x – 5 = 16 x= 7

Expression:An expression is a sentence with a minimum of two numbers or variables and at least one math operation. This math operation can be addition, subtraction, multiplication, or division. The structure of an expression is: Expression is (Number/variable, Math Operator, Number/variable)Example: 2x + 3

INEQUALITITES:An inequality compares two values, showing if one is less than, greater than, or simply not equal to another value. a ≠ b says that a is not equal to b. a < b says that a is less than b. a > b says that a is greater than b.Example:
x + 3 > 2 x=-1

Adjacent angles:Two angles that have a common side and a common vertex (corner point), and don't overlap.

Angles on a point: The measure of all angles formed by three or more rays with the same vertex is 360 degrees

Vertical angles: Two angles are vertical angles(or vertically opposite angles) if their sides form two pairs of opposite rays

Angles on a line: The sum of the measures of two angles that share a ray and form a line in 180 degrees

Area:The area of a figure is the number of unit squares that cover the surface of a closed figure. The area is measured in square units such as square centimeters, square feet, square inches, etc.

Surface area is the amount of space covering the outside of a three-dimensional shape.

Perimeter is the total length of the sides of a two-dimensional shape. We often find the perimeter when putting up Christmas lights around the house or fencing the backyard garden.

Every three-dimensional object occupies some space. This space is measured in terms of its volume. Volume is defined as the space occupied within the boundaries of an object in three-dimensional space. It is also known as the capacity of the object.

For example, the parameter may be the average height of 25-year-old men in North America. The height of the members of a sample of 100 such men are measured; the average of those 100 numbers is a statistic.

For example, the probability of flipping a coin and it being heads is ½, because there is 1 way of getting a head and the total number of possible outcomes is 2 (a head or tail). We write P(heads) = ½ .