Curated OER
What are the Endpoints of a Line Segment?
A simple video on how to identify the endpoints of a line segment. Have your class watch this video to clarify any confusions about endpoints. This could be used as extra help for learners who are having difficulty, or as a supplement to...
Curated OER
How Do You Classify Quadrilaterals?
A rectangle, a rhombus, a square, a trapezoid, and a parallelogram, are these quadrilaterals? What are the criteria that make and shape a quadrilateral? It has something to do with parallel sides, congruent sides, and congruent angles....
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How Do You Identify a Three-Dimensional Figure from a Net?
Learn how to use two-dimensional nets to identify their corresponding three-dimensional figure. The instructor uses diagrams to illustrate the two-dimensional nets and talks about the characteristics of each one to identify its...
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How Do You Find a Missing Angle in a Triangle?
The interior angles of any and ALL triangles adds up to 180 degrees. So if given two of the angle degrees, is it possible to find the value of the third angle? Yes! Use the triangle sum theorem to solve for the missing angle. Watch this...
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How Do You Find Missing Angles in an Isosceles Triangle?
Finding the missing values of two angles in an isosceles triangle is not as difficult as it sounds. But how can two out of three angle's measurements be found? Well, there are special properties about an isosceles triangle which make...
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What's a Venn Diagram, and How Do You Find the Intersection and Union of a Set?
A straightforward illustration of a Venn diagram. Intersection is what the sets have in common, and the union is all the elements of the sets. The diagram certainly helps you see what this means.
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What is a Pyramid?
One base, triangular sides, and defined polygons are all parts of what make up a pyramid. Check out this video and see the instructor draw pictures of a variety of pyramids. She identifies the specific parts and gives them names based on...
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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...
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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...
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What are Supplementary Angles?
What are supplementary angles? They are two angles that when added together make 180 degrees on a straight angle line. Hard to picture that? Then watch this video and see how the instructor illustrates this on a diagram.
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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...
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How Do You Use Complementary Angles to Find a Missing Angle?
Are complementary angles nice to each other? That's not what complementary means in math. Complementary angles are two angles that add up to 90 degrees and form a right triangle. So if given one value in a problem about complementary...
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How Do You Find Missing Angles in a Transversal Diagram?
Parallel lines with a transversal and one given value, find the value of the other seven angles. There are many geometric terms about angles and lines to know the meaning of and understand their relationship to each other. Understanding...
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What are Acute, Obtuse, Right, and Straight Angles?
Angles are identified by the measurement of their angles. Well, that would make sense. The instructor illustrates four different angles and their names by identifying their degrees. Zero to less than 90 degrees is an acute angle, while...
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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...
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What is a Plane?
It's a bird, it's a plane, it's Superman. No, it's really a plane. A plane is named by identifying three points with the exception that they do not form a straight line. A plane can also be identified by a single letter naming it. The...
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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.
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How Do You Find the Measures of Exterior Angles of a Polygon if You Know the Interior Angles?
What are the exterior angles of a polygon? Polygons have exterior angles? How? Oh, extend all the lines, and find the value of each of the supplementary angles. No problem as long as one knows what supplementary angles means. Not sure?...
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How Do You Find Measures of Missing Exterior Angles?
The sum of the exterior angles of any polygon is always 360 degrees. So knowing this, finding missing exterior angles can be done as long as there is only one variable in the equation. All that needs to be done is to add all the known...
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How Do You Find the Sum of the Interior Angles of a Polygon?
Squares, pentagons, triangles, polygons. How is it possible to figure out the sum of the interior angles of any of these multi-faceted shapes? There's got to be a formula. Of course there's a formula. That's what algebra is all about,...
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What is a Polygon?
What makes a figure a polygon? Does it have three or more sides? Is it a closed figure? If the answer is yes to both of those questions then it's a polygon. But wait! Some of these polygons have special names based on the number of sides...
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How Do You Find a Missing Angle in a Quadrilateral?
Oh no, there is a missing angle in a quadrilateral. Where did it go? It didn't go anywhere, it's just missing the value of the angle. So how do you find that missing value? Use a formula of course. Everything in algebra uses a formula....
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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.
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How Do You Use Coordinates to Reflect a Figure Over the X-Axis?
Perform a reflection of a figure over the x-axis. This seems pretty straightforward. But also learn how to use the coordinates to reflect a figure.
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