The complement of a set is the collection of all elements which are not members of that set. Although this operation appears to be straightforward, the way we define "all elements" can significantly change the results.

SchoolOnline's Primary Maths videos are brilliant, bite-size tutorial videos delivered by examiners. Ideal for ages 9-13, they cover every key topic and sub topic covered in Maths in clear and easy to follow steps.



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This video introduces the definition of Velocity. It also walks through a simple, introductory average velocity example problem. At the end it defines speed and discusses the difference between speed and velocity.

Problems and consequences attributed to poor ethical decisions can arise when ethical behavior is not defined, understood, or demonstrated. Consistent focus on ethics helps to foster an environment where ethical behavior is valued,...

👉 Learn how to use the Rational Zero Test on Polynomial expression. Rational Zero Test or Rational Root test provide us with a list of all possible real Zeros in polynomial expression. Rational Zero Test can be helpful to find all the...

Learn about Go's goto keyword, which can simplify the logic of your code -- but when used responsibly and sparingly.

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👉 Learn how to define angle relationships. Knowledge of the relationships between angles can help in determining the value of a given angle. The various angle relationships include: vertical angles, adjacent angles, complementary angles,...

Genes are the true replicators, which can help explain a variety of counter-intuitive traits.

Master Determine the Truth of conditional statements and which ones are logically equivalent

👉 Learn how to define and classify different angles based on their characteristics and relationships are given a diagram. The different types of angles that we will discuss will be acute, obtuse, right, adjacent, vertical, supplementary,...

👉 Learn how to solve with similar triangles. Two triangles are said to be similar if the corresponding angles are congruent (equal). Note that two triangles are similar does not imply that the length of the sides are equal but the sides...

In this video, students will learn how to find the equation of a circle using the Pythagorean theorem. The lesson explores the definition of a circle as the set of points equidistant from a center, and demonstrates how a right triangle...

👉 Learn how to determine whether a given equation is a polynomial or not. A polynomial function or equation is the sum of one or more terms where each term is either a number, or a number times the independent variable raised to a...

Resolve the force of gravity into its parallel and perpendicular components so you can sum the forces.

👉 Learn how to evaluate inverse trigonometric functions. The inverse trigonometric functions are used to obtain theta, the angle which yielded the trigonometric function value. It is usually helpful to use the calculator to calculate the...

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Mr. Fullerton of APlusPhysics.com makes a guest appearance as a floating head to help us learn about Elastic Potential Energy. Several examples of objects which store elastic potential energy are shown and one example of stored elastic...

In this video, Dr Greg Martin takes a look at the question, "what is public heath?" and also considers what it is that public health professionals do including research and surveillance and actions to prevent disease and improve access...

👉 Learn how to define angle relationships. Knowledge of the relationships between angles can help in determining the value of a given angle. The various angle relationships include: vertical angles, adjacent angles, complementary angles,...

This video explains the properties of an isosceles triangle and helps viewers answer a standardized math test question about it. The teacher breaks down each answer choice and shows how to arrive at the correct answer.

👉 Learn about angles in trigonometry. An angle is the figure formed by two rays sharing the same endpoint. The two rays are called the sides of the angle while the common endpoint of the two rays is called the vertex of the angle. Angle...

How much water should you drink every day? Not as much as you've been told. This summer, like many summers before it, has seen a rash of articles warning us not only that is dehydration is dangerous, but that it is also ubiquitous. Real...

Archimedes principle states that if an object is submerged in a fluid, then the buoyant force acting on it is equal to the weight of the fluid displaced by that object. Buoyant force exists because pressure increases as an object goes...