Brightstorm
Solving Proportions
Find out if the amount of practice is proportional to better test scores. The video explains the steps learners perform to solve a proportion. Supplemental videos show examples of solving proportions of varying difficulty, which helps...
Curated OER
How Do You Prove that Two Overlapping Triangles are Congruent?
Given two overlapping triangles with a congruent angle, a common angle, and a congruent side, a simple proof is shown in this video. Using the ASA (angle-side-angle) postulate, the instructor shows how the two triangles are congruent.
Curated OER
Rectangular Coordinate System
Everything you need to understand the rectangular coordinate system is explained in this easy to follow video. Great for elementary to middle schoolers learning about plotting points, graphing, and locating points on a coordinate grid....
Scholastic
Study Jams! Classify Triangles
Jam on with this multi-faceted activity teaching triangle classification. Start with a learner-paced lesson describing the different qualities of triangles and follow with a fun karaoke session. Also provided are two types...
Scholastic
Study Jams! Transformations
Flip, spin, and shift with this vocabulary-rich video on transformations. Learners watch different movements and see how to move an object without affecting its size. The video follows with a multiple choice assessment that...
Curated OER
What are Skew Lines?
Skew lines? What? By definition, skew lines are lines on different planes that never intersect. Watch this video and get an explanation along with a visual diagram.
Curated OER
What is a Transformation?
A transformation is the process of changing the graph of a figure or a shape. The instructor introduces the four most common transformations: reflection, dilation, rotation, and translation. So watch as she draws the transformations on a...
Curated OER
What are Vertical Angles?
What makes vertical angles so special? Here's a few words that might help you figure out why: intersecting lines, congruent angles, opposite, supplementary angles. Still wondering? Then watch this video for a good explanation of vertical...
Curated OER
How Do You Use a Graph to Reflect a Figure Over the X-Axis?
A reflection is just what you think it is, a mirror image. So how do you reflect a figure on a graph? Just flip it over. The teacher illustrates how to select a line of reflection (the x-axis) and make the calculations to flip the figure.
Curated OER
How Do You Find a Value for x that Makes Two Lines Parallel?
So you have a transversal line intersecting two parallel lines and you are looking for a value that would make two corresponding angles congruent. You have all the information needed to write an equation to find the value. So write that...
Curated OER
What is a Translation?
A translation means moving a figure to another location by sliding it. The figure, called the image, maintains its size and shape. You can move the image horizontally, vertically, or a combination of both.
Curated OER
How Do You Find Angle Measures for Adjacent Angles?
Two angles with given values are adjacent. Together they are 172.5 degrees. How do you find the degree of one of the angles? You will have to write an algebraic equation with the given information to solve for the value of the variable....
Curated OER
What Does Congruent Mean?
Two figures are congruent if they have the same size and shape. Line segments can also be congruent if they are of the same length. Vertical angles created by intersecting lines are always congruent. Polygons that have matching angles...
Curated OER
How Do You Make a Figure Larger Using a Dilation?
A dilation increases or decreases the size of a figure. In this lesson the teacher shows you how to use a scale factor of three to dilate the given figure. She identifies the ordered pairs, multiplies them by three, plots the new...
Curated OER
What is an Angle?
An angle is formed when two rays share a common endpoint. Want to know more about angles? There are a lot of terms in this lesson. You might have to watch it two or even three times to make sure you understand all the terms. I recommend...
Virtual Nerd
What are Interior and Exterior Angles of a Polygon?
Break down interior and exterior angles with this video. Using a pentagon, a teacher demonstrates how to find the interior and exterior angles of a polygon. She goes on to explain a few of the properties of these angles, writing down all...
Curated OER
How Do You Rotate a Figure 180 Degrees Around the Origin?
Demonstrate how to rotate a figure around the origin of a coordinate plane. The instructor in this video tutorial explains the concept deliberately, showing how to complete the rotation as she presents the information. After she finishes...
Curated OER
How Do You Rotate a Figure 270 Degrees Clockwise Around the Origin?
Pupils who view this tutorial will gain a better understanding of how to rotate a figure around the origin of a coordinate plane. This video covers how to rotate clockwise and counterclockwise to achieve the same purpose. Show this video...
Curated OER
How Do You Rotate a Figure 90 Degrees Clockwise Around the Origin?
Show your class how to rotate a figure 90 degrees clockwise around the origin of a coordinate plane. The lecturer in this video explains the concepts and steps involved in reflecting a figure across the y-axis. Consider providing this...
Curated OER
How Do You Find Missing Angles in a Triangle With Variables?
Are you working on finding the missing angles in triangles in your class? Consider this video. An instructor uses the triangle sum theorem to create an equation that helps her find the missing angles. She explains each step and writes...
Curated OER
How Do You Solve a Problem Using Indirect Measurement with Shadows?
Using indirect measurement, this video shows viewers how to find the height of a flagpole. The lecturer employs drawings as well as proportions to solve this problem, explaining each step. A useful resource to aid struggling learners and...
Curated OER
What is a Tangent Line to a Circle?
This video defines what it means for a line to be tangent to a circle. It also defines the term point of tangency and shows how the radius drawn to the point of tangency is perpendicular to the tangent line.
Curated OER
How Do You Find a Missing Side of a Right Triangle Using Cosine?
Trigonometry? What's trigonometry. Well, something to do with triangles, right? Right! Right triangles! In this problem, find the missing length of one of the sides. So set this up as a ratio: cosine(A) = adjacent side length divided by...
Curated OER
How Do You Find the Volume of a Rectangular Pyramid?
How do you find the volume of a rectangular pyramid? Watch this video and find out! In the tutorial, a lecturer works through an example problem. While she works, she describes each step and each formula necessary to solve the problem. A...
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