Curated OER
How Do You Find the Lateral and Surface Areas of a Cone if You Don't Know the Slant Height?
Did you know you can use the Pythagorean theorem to find the slant height of a cone? You can! Just watch this tutorial and see how you can find the lateral and surface area of a given cone using slant height and the Pythagorean theorem.
Curated OER
How Do You Find the Area of a Triangle?
The formula for the area of a triangle is: area equals one half the base times the height. If you have been given these two values then all you need to do is plug them into the formula and solve. Don't forget to write the correct ending...
Curated OER
How Do You Find the Area of a Trapezoid?
Trapezoids can be tricky! Break down the process of finding the area of a trapezoid with an engaging math video. Learners explore area formula and shown exactly how to plug in information, solve, and simplify.
Curated OER
Why Are the Angles of Equilateral Triangles Always Equal to 60¼?
Learn how to identify an equilateral triangle by evaluating its congruent sides. Once you've determined that that sides are congruent you'll be able to use the triangle sum theorem to determine the angles in an equilateral triangle. This...
Curated OER
How Do You Find Missing Angles in a Triangle With Variables?
Are you working on finding the missing angles of 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
What is a Triangle?
Triangles, triangles, triangles. What makes a polygon a triangle? How many types of triangles are there? How do you determine what kind of triangle it is? Watch this video as the teacher explains 'tri' meaning three, making a triangle -...
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 Determine if a Triangle Is a Right Triangle if You Know its Sides?
Use the Pythagorean Theorem formula to check if this given triangle, with the given lengths of each side, is a right triangle. It's as simple as plugging the given values into the formula and doing the math to see if the solution checks...
Curated OER
What Is the Distance Formula?
Find the distance between two points on a coordinate plane. How is that done? Let's take a look at the distance formula. What's the distance formula? Well, it's a form of the Pythagorean Theorem. How? Watch the instructor diagram and...
Curated OER
Hypotenuse
Entertain your students with this fun video where students explain how to solve for the hypotenuse. They are clearly enjoying themselves while they explain how to use the Pythagorean theorem.
Curated OER
Determining Whether a Group of Sides Can Form a Triangle
How do you know if three given lengths of lines can form a triangle? This lesson will give you two rules to help you determine if you can make a triangle.
Curated OER
Determining the Angle of Elevation Using Tangent
What's the angle of elevation? Using several tangent formulas, the instructor calculates the angle of elevation. He has two examples that are engaging.
Curated OER
Common Angle Measures
Using a circle with clock like hands, the tutor explains common angle measurements. She shows that a full circular rotation equals 360 degrees, a quarter rotation equals 90 degrees, a three-quarters rotation equals 270 degrees, and a...
Curated OER
Area of a Triangle - Geometry Help
Do you know what A=1/2 bh means? If you don't this video on the area of a triangle is a must. It defines the formula needed to determine the area of a triangle, works through an example problem, and clearly explains the procedure.
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
How Do You Find the Volume of a Triangular Pyramid?
Instruct your class on how to find the volume of a triangular pyramid using this tutorial. Learners can watch the video and take notes, later applying what they have seen to class work or homework. A clear video with direct instruction,...
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
How Do You Find the Area of a Trapezoid?
Trapezoids can be tricky. Break down the process of finding the area of a trapezoid with this video! Viewers are given information about the area formula and shown exactly how to plug in information, solve, and simplify. This is a...
Virtual Nerd
How Was the Distance Formula Derived?
Are you working on the distance formula? Derive the distance formula and help your learners by showing them the logic behind the distance formula. This practical video should help conceptual understanding and is appropriate for in-class...
Virtual Nerd
What is a Prism?
I always thought a prism was a solid triangular shaped piece of glass that made rainbows when the light shined through it. Well, that is a prism, but that is only one example of a prism, as prisms are three-dimensional solids of a...
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
What is the Formula for the Volume of a Prism?
Is prism just another mathematical term for a solid? It must be since this lesson is about volume. The teacher illustrates and explains how to find the volume of a rectangular prism and also how to find the volume of a triangular prism....
Curated OER
How Do You Find a Scale Factor in Similar Figures?
Three angles of one triangle are equal to the corresponding angles in another triangle. Use a ratio of corresponding sides to find the scale factor. Actually, there are two scale factor values. The instructor will explain how to get both...