Curated OER
How Do You Use Coordinates to Reflect a Figure Over the Y-Axis?
Perform a reflection of a figure over the y-axis. This seems pretty straightforward. But also learn how to use the coordinates to reflect a figure.
Curated OER
How Do You Use a Graph to Translate a Figure Diagonally?
This presentation is pretty straightforward in illustrating how to translate a figure on the coordinate plane. Watch the instructor follow the directions to translate the figure four units to the right and six units down.
Curated OER
How Do You Use Coordinates to Translate a Figure Horizontally?
There are many ways to transform a figure on a coordinate plane. This problem requires the movement to be four units horizontally to the right. Using the original coordinate pairs, a positive 4 can be added to each x-value to get the new...
Curated OER
How Do You Use Coordinates to Translate a Figure Vertically?
Transform the figure six units vertically down. Use the given coordinate points to translate by subtracting 6 from each of the given y-values. Then plot the new coordinates points and connect the dots.
Curated OER
How Do You Find Missing Angles in an Isosceles Triangle Using Right Triangles?
Given an isosceles triangle, and the value of one angle, find the missing values. There are some special properties about isosceles triangles. Use the triangle sum theorem to solve this problem. Watch this video to see how the instructor...
Curated OER
How Do You Find a Missing Angle in a Right Triangle?
The triangle sum theorem states that the interior angles of a triangle add up to 180 degrees. So it seems logical that if there are two known values given for the interior angles of a triangle, the third value could be found using this...
Curated OER
How Do You Find the Angles in a Triangle if You Have a Ratio of Their Measures?
Use the Triangle Sum Theorem to find the value of each of the inside angles of a triangle. This triangle problem has to do with the ratio of the angles to each other. Find the measure of each angle if the ratio is 1:3:8. Not sure how to...
Curated OER
What are Acute, Obtuse, and Right Triangles?
Triangles are classified by their angle measurement as well as by the length of their sides. Here are some names that identify the types of triangles: right, isosceles, equilateral, scalene, obtuse, and acute. Watch this video to learn...
Curated OER
What are Equilateral, Isosceles, and Scalene Triangles?
Triangles are classified by their angle measurement as well as by the length of their sides. Here are some names that identify the types of triangles: right, isosceles, equilateral, scalene, obtuse, and acute. Watch this video to learn...
Curated OER
How Do You Classify Triangles?
Triangles are classified by their angle measurement as well as by the length of their sides. Here are some names that identify the types of triangles: isosceles, equilateral, scalene, obtuse, and acute. Watch this video to learn about...
Curated OER
What is the Formula for the Area of a Parallelogram?
So you are trying to tell me that a parallelogram is a rectangle in disguise? Wow! And I can use a similar formula of the area of a rectangle to find the area of a parallelogram? Wow! Ok, show me how! A=bh. So simple really.
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,...
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...
Khan Academy
SAT Prep: Test 1 Section 9 Part 3
If it takes a long time to complete the problems on the math SAT, it doesn't matter if they are correct - the problems that are left over will count against the student's score. Sal takes care to show quicker ways to complete problems...
Khan Academy
Parallel Lines From Equation, Mathematics I, High School Math
Here is a fairly basic video that uses three equations, each written in slope-intercept form, to determine whether the lines are parallel. Sal graphs each equation on the same coordinate plane to show how their slopes compare. The video...
Khan Academy
SAT Prep: Test 3 Section 2 Part 4
Finding perimeters and slopes is the focus of this video, which details ways to solve problems 15-17 on the practice SAT. Even students who are confident in their ability to pass the SAT would benefit from this additional review.
Khan Academy
SAT Prep: Test 1 Section 6 Part 5
Back with "more energy," Sal begins his explanation of problems 15-18 on page 412 of The Official SAT Study Guide. Problems include angles of equilateral triangles, rectangles, and graphing slopes.
Curated OER
Intro to the Trigonometric Ratios
This video introduces the basics of trigonometry. It starts by defining a right triangle and showing two different examples of finding the ratios of sine, cosine, and tangent using the SOH-CAH-TOA mnemonic. This resource could be used as...
Curated OER
Tau vs. PI
What�s wrong with Pi? In this video, Sal considers the question whether the number Tau (_), is a better number to use in our trigonometric model then the traditional PI (�). First, Sal reviews the definition of Pi, the trigonometric...
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.
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...
Krista King Math
Degree Measure of an Arc
Circular patterns and movement are commonplace in our world. Young mathematicians begin their study of circles with instruction on finding the degree measure of both major and minor arcs. Examples focus on the arc in relation to the...
Curated OER
How Do You Find the Length of a Rectangle if You Know its Width and Area?
Learn how to use the formula for area to solve a problem about a rectangle. The demonstrator shows how to plug in the known values of a rectangle, and then how to use the formula for area to solve for the variable in question.
Curated OER
How Do You Find the Perimeter of a Shape?
Perimeter, area. Area, perimeter. Which is which? Perimeter is the distance around the edge of the shape. So all you have to do is add up the values.
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