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How To: Prove side-side-side congruency

In this "Math Made Easy" geometry episode, you learn how to prove that two triangles are congruent (equal) by using the "side-side-side" evidence. By using "side-side-side" to prove that two triangles are congruent, you are stating that all the respective corresponding sides of two triangles are equal in length thus proving the triangles are congruent. The narrator in this tutorial provides you with definitions about statements, proofs, and congruency. This becomes useful when setting up a ta...

How To: Prove some random trigonometric identities

This video shows the method to prove some trigonometric identities. This involves the use of algebra and knowledge of basic trigonometric identities. The video demonstrates three examples to illustrate this problem and its solution. The first problem shows a relatively simple problem involving sines and cosines. The video shows some basic algebra steps to simplify the problem and prove the identities. The second example involves a slightly complicated problem involving square of combination o...

How To: Prove Heron's Formula

This two part video walks you through the steps of in proving Heron's formula. This excellent video shows you a clean blackboard, with the instructors voice showing exactly what to do. Don't fret, any question you may have, will be answered. Watching this video will make you feel like your back in the classroom but rather comfortably from your home.

How To: Prove the log a + log b = log ab logarithm property

See how to prove the log a + log b = log ab logarithmic property with this free video math lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll...

How To: Prove Rank(A) = Rank(transpose of A) in linear algebra

Learn how to prove that the rank of a matrix, A, is equal to the rank of its transpose in linear algebra. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test).

How To: Prove an inscribed angle is half of a central angle

This video walks you through the steps to prove an inscribed angle is half of a central angle that subtends the same arc. This excellent video shows you a clean blackboard, with the instructors voice showing exactly what to do. Don't fret, any question you may have, will be answered. Watching this video will make you feel like your back in the classroom but rather comfortably from your home.

How To: Prove angle-side-angle congruency

This is a tutorial about how to prove the congruency (equality) of two triangles when the values of two angles and an included side of each triangle is given. The author of this video instructs the viewer that it should be first determined whether the values of two angles of one triangle are the same as those of two angles of the other triangle. Then one must seek to determine the equality of sides included in those angles in both the triangles. When it is found that these three values in one...

How To: Perform an extremely cool trick using Red Bull

In this clip, learn how to perform the "Amazing Red Bull" trick. You will show your audience a full can of Red Bull and pour a bit out to prove it. You will then flip the can completely upside down without ANY liquid spilling out! You can also shoot something like a pencil or pen inside the upside down can to prove that there is an opening. This trick relies on a bit of slight of hand and some help from gravity. Check it out and totally amaze your friends with this cool illusion.

How To: Prove cos(a+b)=(cos a)(cos b)-(sin a)(sin b) in trig

Need help proving the cos(a+b) = (cos a)(cos b)-(sin a)(sin b) trigonometric identity? This free video lesson will show you how. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series ...

How To: Prove sin(a+b)=(cos a)(sin b)+(sin a)(cos b) in trig

Need help proving the sin(a+b)=(cos a)(sin b)+(sin a)(cos b) trigonometric identity? This free video lesson will show you how. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of...

How To: Prove congruent triangles with SSS and SAS

This is a video tutorial on how to prove congruent triangles with SSS and SAS test. SSS means side-side-side and SAS means side-angle-side. For applying the SSS test of congruency, each side of one triangle must be congruent to the corresponding side of the other triangle. For applying the SAS test of congruency, two corresponding sides of the two triangles must be congruent as well as the angle between those two sides of each triangle must be congruent. Follow the rest of the video to unders...

How To: Build a potato battery

Like a lemon, a potato can produce electricity. This science experiment was prepared by Ebtisam Al Anzoor and demonstrated by Mustafa Daif. The electricity is proven using an analog micro ameter. The positive is copper from a penny or copper coin while the negative is a galavanized nail. The potato releases a charge and is further proven when it is connected to a calculator. You can daisy chain the potatoes for a greater charge.

How To: Geometrically prove the Pythagorean theorem

From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps. With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to perform a geometric proof of the Pythagorean theorem.

How To: Remove a canker-diseased branch with a saw

Cankers, if left untreated, can grow and prove lethal for your trees. In this installment of the Fruitwise Heritage Apple guide to apple pruning, Stephen Hayes demonstrates how to amputate a diseased tree branch with a saw. Watch and learn why, as Stephen puts it, "a seen canker is a gone canker."

How To: Cure acne with a homemade mask

Take care of that acne without any expensive products that dry you out. This proven method only requires three ingredients: Oatmeal, honey and bioyogurt. This all natural remedy is all you need to have beautiful, clear skin again. This video will show you how make a natural homemade acne mask.

How To: Make gluten-free gravy

Don't give up turkey gravy just because you're cooking for a gluten-free diet. Use these tips when preparing this Thanksgiving favorite. Gluten-free diets are proven to help digestion and ease a variety of ailments. This gravy will make your gluten-free meal savory.

How To: Play the didgeridoo for beginners

Interested in learning how to play the didgeridoo? If so, this video lesson may prove a good place to begin. This tutorial will walk you through the rudiments of didgeridoo playing, including tonal techniques for varying the pitch, volume and timbre of your didge. For more information, and to get started playing didgeridoo yourself, watch this helpful video tutorial.

How To: Be Ke$ha for Halloween

Ke$ha has become proved to us over the last year or so that there is room for more than one space-diva at the top of the music charts. Her looks are fast becoming iconic, and if you want to dress as her for Halloween you've come to the right place because this video will teach you exactly how to do it.

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