We've decomposed numbers before to make them easier to work with, like how we decompose the number 12 into 10 + 2. That same concept is really helpful when working with angles, too! Especially when there's an unknown angle, we can...

A video entitled “Proofs” which explores how to set up geometric proofs.

A video entitled “Area of Oblique Triangles” which models how to calculate the areas of oblique triangles.

In this video, the teacher explains how to find the measures of angles formed by parallel lines and a transversal. They use the properties of supplementary angles, alternate interior angles, and the triangle sum theorem to solve for the...

In this video, you will learn how to find the measure of an acute angle in a right triangle using the inverse sine function. The video explains the ratios of side lengths for the trigonometric functions and introduces the concept of...

This video explains how to use inverse trigonometric functions to find angle measures in right triangles. It covers the definitions and properties of inverse trig functions and demonstrates their application through example problems.

In this video, the teacher explains how to use interior angles to find unknown angle measures. They specifically focus on consecutive interior angles, which are angles on the same side of a line. The teacher provides examples and walks...

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...

In this video, you will learn how to measure angles in standard position by placing them correctly in the coordinate plane. You will also understand the concept of negative angle measures and coterminal angles.

👉 Learn about polygons and how to classify them. A polygon is a plane shape bounded by a finite chain of straight lines. A polygon can be concave or convex and it can also be regular or irregular. A concave polygon is a polygon in which...

In this video, we learn how to find the measure of a circumscribed angle by understanding the relationship between central angles and circumscribed angles. By manipulating angles within quadrilaterals and using the properties of...

In this video, the teacher explains the concept of opposite angles in a cyclic quadrilateral and demonstrates how to find their sum using the central angle theorem. The central angle theorem states that the measure of an inscribed angle...

In this video, students will learn how to rotate a point using angle measures and distances. The teacher explains how to create angles using the origin and the X axis, and demonstrates how to measure the angle using a virtual protractor.

👉 Learn how to determine the truth or false of a conditional statement. A conditional statement is an if-then statement connecting a hypothesis (p) and the conclusion (q). If the hypothesis of a statement is represented by p and the...

This video explains how to find the angle measures and side lengths of an oblique triangle when all the side lengths are given. It introduces the law of cosines as a formula that relates the sides and angles of a triangle. The video...

In this video we go over parts of a degree, and congruent angles.

👉 Learn the basics of co-terminal angles. An angle is a figure formed by two rays that have a common endpoint. The two rays are called the sides of the angle while the common endpoint is called the vertex of the angle. We measure angles...

Master how to convert an angle in degrees to radians

Master how to convert an angle in radians to degrees

In this video, the teacher explains the concept of triangles and their angles, and how to identify similar triangles based on their corresponding angles and aspect ratios. The teacher also introduces the concept of scale factor and how...

👉 Learn how to evaluate the inverse of reciprocal trigonometric functions. Recall that the reciprocal trigonometric functions are given by the ratio of 1 and the corresponding trigonometric function. When an angle is unknown but the...

SchoolOnline's Secondary Maths videos are brilliant, bite-size tutorial videos delivered by examiners. Ideal for ages 13-17, they cover every key topic and sub topic covered in GCSE Maths in clear and easy to follow...

👉 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...

In this video, the teacher explains how to use the properties of parallelograms and triangles to solve real-world problems. They demonstrate this by using the example of constructing a wooden gate, where they determine the lengths of...