Why is it important to do proofs? What is a proof? Why does every statement have to be true?<br/>
Geometric Proofs, Part 1

In this video, we explore how to efficiently find the measure of one acute angle in a right triangle. We learn that the size of the angles in a right triangle is based on the length of the sides, and that the acute angles co-vary or...

In this video, the teacher explains how to find the exact value of the sine of 120 degrees without using a calculator. They introduce the concept of reference angles and how they can be used to determine the trigonometric ratios for...

This video is a comprehensive lesson on circle theorems, including an extension on the topic. The presenter covers the key four circle theorems that students should know, including the arrow shape, bow shape, quadrilateral, and...

In this video, the teacher explains why only some right triangle hypotenuses combine to make a straight line. They demonstrate that when the ratios of the sides of two right triangles are equal, they can be placed together to form a...

In this lesson, students learn how to solve real-world problems involving similarity criteria. Using the example of finding the distance across a canyon, they apply the vertical angle theorem and angle-angle similarity postulate to...

In physics many students discover that they need to learn to understand the material rather than memorize it. This video discusses and shows examples of the differences between the two.

In this lesson you will learn how to prove the Pythagorean Theorem by using similar triangles.

In this video, the teacher explains the concept of Y equals MX and where it comes from. They use the idea of similar triangles to derive the equation. The lesson emphasizes that the equation represents a line passing through the origin...

In this video, students learn how to identify quadrilaterals by finding shapes with four straight sides that meet at four corners. They are taught to use a straight edge or ruler to check for straight sides and ensure that all sides meet...

In this lesson you will learn how to determine if a triangle is a right triangle by applying the Area of Squares Proof.

In this video series I show you how to evaluate the six trigonometric functions when given a point. We do this by creating a right triangle and finding the hypotenuse by using the Pythagorean theorem. #trigonometry...

👉 Learn how to apply transformations of a figure and on a plane. We will do this by sliding the figure based on the transformation vector or directions of translations. When performing a translation we are sliding a given figure up,...

This video explains how fractional pieces that have different shapes can still be equivalent. By using cake models, the teacher demonstrates that one fourth of a rectangle and one fourth of a triangle are both equal to one fourth of a...

Learn how to solve problems with tangent line. A tangent line to a circle is a line that touches the circle at exactly one point. The tangent line to a circle makes a right angle with the radius of the circle at the point of its...

👉 Learn how to evaluate an expression with the composition of a function and a function inverse. Just like every other mathematical operation, when given a composition of a trigonometric function and an inverse trigonometric function,...

👉 Learn how to evaluate the secant of the sum or difference of two angles using the sum/difference formulas. To do this, we first use the Pythagoras theorem to obtain all the sides of the right triangle in the unit circle. Recall that...

The video provides a clear explanation of the sine, cosine, and tangent functions and their corresponding graphs. It starts by introducing the unit circle and how it relates to the functions. Then, it explains the formulas for each of...

This video lesson explains the concept of exterior angles in triangles and how they are related to the interior angles. It demonstrates how to find the measures of exterior angles using the sum of interior angles. It also applies this...

This video covers exam strategy, Geometry, Perimeter, Area, Angles, Circles. This is part 14 from the series 'Introduction to the Math Section of the SAT'.

👉 Learn all about evaluating trigonometric functions with triangles. In this playlist, we will learn how to evaluate, sine, cosine, tangent, cotangent, secant, and cosecant when given the sides of a triangle. If we have missing sides we...

This video is a tutorial on the topics of economic rent and transfer earnings in labor markets. It starts with defining these two terms and explaining their differences, using examples and diagrams to illustrate the concepts. The video...

👉 Learn how to find the volume and the surface area of a prism. A prism is a 3-dimensional object having congruent polygons as its bases and the bases are joined by a set of parallelograms. A prism derives its name from the shape of its...

What is the magnitude of the acceleration of a ball traveling around a circular path if it's constrained to have a constant vertical velocity? Always start these problems by doing a velocity analysis, then finish it by doing an...