Curated OER
What is a Reflection?
There are many ways to transform geometric figures. This lesson will illustrate how to reflect figures over a line to get a mirror image of the figure. The teacher will draw three different reflections: one as reflected over the y-axis,...
Brightstorm
Pythagorean Theorem Proofs
Your class knows the Pythagorean Theorem, but can they prove it? A series of three videos shows two proofs of the Pythagorean Theorem and use it to classify triangles.
Scholastic
Study Jams! Classify Quadrilaterals
Face the vertex of two-dimensional shapes and discover what each figure requires as part of its classification. With one shape per slide, learners see what makes each shape special and compare it to others with similar qualities.
Krista King Math
Naming Simple Geometric Figures
Mathematicians use notation for efficiency, so make your classes more efficient! The instructor explains the definition and notation for key elements of geometry such as points, lines, and planes. This is the 37th lesson is a series of...
Corbett Maths
Equations – Cross Multiplication
Mastering the art of solving a proportion is not only important for algebra, but it's crucial to geometry and statistics as well. A quick video demonstrates the use of cross multiplication to solve a proportion. The lesson includes...
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...
Teaching Channel
Algebra Skills: Support at Every Step
"My biggest challenge in class is to get some students to put a pen to paper, because they don't want to make a mistake." Discover how two teachers are working to help special education students develop the skills they will...
TED-Ed
Why Are Manhole Covers Round?
Discover the peculiar geometric property of the curve of constant width, the Reuleaux triangle, and their intriguing connection to manhole covers with yet another fascinating TED-Ed video.
TED-Ed
The Mathematics of Sidewalk Illusions
How do they create those 3-D views on a 2-D surface? The video presents the history of the art of using anamorphic perspective. A review of perspective drawing provides background knowledge to the class. Pupils see different methods...
Curated OER
Area of Circles
Using a basic formula one can find the area of a circle. Duane walks learners through the steps needed to determine the missing variable, plug in the known variable, and solve to find the area of a circle. He provides two different...
Curated OER
Circles: Radius, Diameter and Circumference
Fascinating discussion regarding the origin of Pi accompanies a detailed explanation of how to find the circumference of a circle. Since this is the first installment in a series on circles, the concept of circumference is separated into...
TED-Ed
How Many Ways Are There to Prove the Pythagorean Theorem?
There is more than one way to prove the Pythagorean Theorem. Euclid and Einstein found the same way to prove the Pythagorean Theorem. The video introduces several other ways to prove the theorem along with the history of its use.
Math Planet
Math Planet: Geometry: Triangles
Discussion of triangles through the use of examples and a video lesson. [1:08]
Sophia Learning
Sophia: Coordinate Geometry of Rectangles
Coordinate geometry of rectangles is investigated in this video lesson. The tutorial demonstrates how to use the midpoint, distance, and slope formulas to determine if a quadrilateral is a rectangle on a coordinate plane. [17:26]
Sophia Learning
Sophia: Coordinate Geometry of Parallelograms
This lesson will demonstrate how to use slope, midpoint, and distance formulas to determine from the coordinates of the vertices if a quadrilateral is a parallelogram in a coordinate plane. Students can check their understanding with an...
Khan Academy
Khan Academy: Geometry: Ca Geometry: Triangles and Parallelograms
In this video lesson [11:14], the instructor demonstrates solutions to problems #21-25 of California Geometry released state test questions. Problems address understanding of the triangle inequality theorem, angle relationships with...
Sophia Learning
Sophia: Geometry: Measurement of Angles in Radians: Lesson 3
During this lesson, you'll find out how radians are related to angles, how to note radians, and what certain radians stand for. It is 3 of 5 in the series titled "Measurement of Angles in Radians." [2:10]
Sophia Learning
Sophia: Geometry: Measurement of Angles in Radians: Lesson 4
During this lesson, you'll find out how radians are related to angles, how to note radians, and what certain radians stand for. It is 4 of 5 in the series titled "Measurement of Angles in Radians." [3:19]
Sophia Learning
Sophia: Geometry: Measurement of Angles in Radians: Lesson 1
During this lesson, you'll find out how radians are related to angles, how to note radians, and what certain radians stand for. It is 1 of 5 in the series titled "Measurement of Angles in Radians." [3:05]
Khan Academy
Khan Academy: Algebra: Pythagorean Theorem 3
The video tutorial lesson [3:00] demonstrates the solving the width of a rectangular carpet by using the Pythagorean theorem, given the length and the diagonal of the rectangle.
Khan Academy
Khan Academy: Algebra: Conic Sections: Tangent Line Hyperbola Relationship
A video lesson showing the algebraic relationship between the equation of an arbitrary hyperbola and its arbitrary tangent line. [10:04]
Khan Academy
Khan Academy: Algebra: Conic Sections: Three Points Defining a Circle
A video lesson that describes how any three non-collinear points actually define a circle. First it is shown that three points define a triangle. Then it is shown that the circumcenter of that triangle is actually the center of the...
Sophia Learning
Sophia: Practice With Rotations
Explore how to rotate a geometric object across a coordinate plane with this video lesson. [10:37] Assess learning with a quiz.
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