The basic area formulas presented as reasoned methods rather than formulas to be memorized. Part 3 deals with how to find the areas of more complicated shapes and introduces the Surveyor's method. ... https://www.youtube.com/watch?v=bM5HYU2BdoU
This is part of a series of arithmetic lessons created for my grandkids, but I'm opening them to the world. You can access an annotated index with links on my Math Without Borders website here: https://mathwithoutborders.com/the-grandpa-project
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https://www.youtube.com/watch?v=P9CzQxUuApY
This lesson from the HSC Algebra 2/Trigonometry course introduces augmented matrices as a method for solving systems of equations.
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https://www.youtube.com/watch?v=JTvcrCaRhUU
This is part of a series of arithmetic lessons created for my grandkids, but I'm opening them to the world. You can access an annotated index with links on my Math Without Borders website here: https://mathwithoutborders.com/the-grandpa-project
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https://www.youtube.com/watch?v=Wv7aJqihwo8
This is a demonstration originally created as a presentation for the Denver Astronomical Society. The purpose of the presentation is to simplify understanding how the Copernican description of the solar system relates to what can be directly observed in the sky. The simplified models I am using are based on circular orbits. (This simplification is appropriate here because the goal is conceptual understanding rather than precise prediction for observation purposes.)
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https://www.youtube.com/watch?v=dCnC5dUs6go
This video lesson is from the Home Study Companion to Paul Foerster's Algebra 1: Expressions, Equations, and Applications. See http://MathWithoutBorders.com for more information.
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https://www.youtube.com/watch?v=YZoblMYkYyk
This video lesson is from the Home Study Companion to Paul Foerster's Algebra and Trigonometry: Functions and Applications. See http://MathWithoutBorders.com for more information.
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https://www.youtube.com/watch?v=wHCIY0_ArY8
The basic area formulas presented as reasoned methods rather than formulas to be memorized. Part 1 deals with rectangles, parallelograms, triangles, and trapezoids.
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https://www.youtube.com/watch?v=zYNiYEVo4Ww
This is the second lesson in a sequence. This lesson applies the augmented matrix method to solve a 3x3 system of equations and converts the method into a spreadsheet program.
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https://www.youtube.com/watch?v=S36625OtptY
3-D demonstration of the motions of the sun and moon in the sky, created using Visual Python (VPython).
[By the way, given the number of clueless comments, it seems I must point out, this simulation HAS ABSOLUTELY NOTHING TO DO WITH THE MIND NUMBINGLY LUNATIC FLAT EARTH "THEORY" NONSENSE!!! (Don't waste my time.) This is about the apparent sky for a localized observer: a phenomenological perspective one has for observational astronomy or navigation. (Go outside and look up!) When you stand on the ground and see a few hundred yards, the earth appears locally flat. You lack depth perception for cosmic distances because your eyes are close together compared to the distances involved. That's why the sun, moon, and stars appear to be at the same distance. When everything in the cosmos appears the same distance away, it gives the illusion that they all lie on a sphere centered on the observer. Hence the sphere of the sky is an illusion. This simulation is about understanding this localized perspective.]
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https://www.youtube.com/watch?v=5k--My8fnes