How Many Triangles Are There? Learn The Formula For Any Size!
How many triangles are formed in a grid of equilateral triangles with N triangles in its base? The video shows a pattern in the case of n=4 and presents a formula for the general case.
Blog post (text explanation): http://wp.me/p6aMk-4sO
There are many ways to prove the formula, links in this stackexchange discussion: http://math.stackexchange.com/questions/203873/how-many-triangles
Ask Dr. Math explanation: http://mathforum.org/library/drmath/view/56194.html
Sum of numbers 1 to N visually: https://youtu.be/bjjmuOd1fdc?t=5m43s
Sum of numbers 1 to N algebraically: https://youtu.be/UepJT8vT0YY
If you like my videos, you can support me at Patreon:
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Видео How Many Triangles Are There? Learn The Formula For Any Size! канала MindYourDecisions
Blog post (text explanation): http://wp.me/p6aMk-4sO
There are many ways to prove the formula, links in this stackexchange discussion: http://math.stackexchange.com/questions/203873/how-many-triangles
Ask Dr. Math explanation: http://mathforum.org/library/drmath/view/56194.html
Sum of numbers 1 to N visually: https://youtu.be/bjjmuOd1fdc?t=5m43s
Sum of numbers 1 to N algebraically: https://youtu.be/UepJT8vT0YY
If you like my videos, you can support me at Patreon:
https://www.patreon.com/mindyourdecisions
Connect on social media. I update each site when I have a new video or blog post, so you can follow me on whichever method is most convenient for you.
My Blog: https://mindyourdecisions.com/blog/
Twitter: https://twitter.com/preshtalwalkar
Facebook: https://www.facebook.com/pages/Mind-Your-Decisions/168446714965
Google+: https://plus.google.com/108336608566588374147/posts
Pinterest: https://www.pinterest.com/preshtalwalkar/
Tumblr: https://preshtalwalkar.tumblr.com/
Instagram: https://instagram.com/preshtalwalkar/
Patreon: https://www.patreon.com/mindyourdecisions
Newsletter (sent only for big news, like a new book release): http://eepurl.com/KvS0r
If you buy from the links below I may receive a commission for sales. This has no effect on the price for you.
My Books
"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.9/5 stars on 32 reviews)
http://amzn.to/1uQvA20
"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 4.6/5 stars on 3 reviews)
http://amzn.to/1o3FaAg
"Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews.
http://amzn.to/1GhUUSH
"Math Puzzles Volume 2" is a sequel book with more great problems. (rated 4.3/5 stars on 4 reviews)
http://amzn.to/1NKbyCs
"Math Puzzles Volume 3" is the third in the series. (rated 3.8/5 stars on 5 reviews)
http://amzn.to/1NKbGlp
"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews)
http://amzn.to/1LOCI4U
"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 4 reviews)
http://amzn.to/18maAdo
"Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 3 reviews)
http://amzn.to/XRm7M4
Видео How Many Triangles Are There? Learn The Formula For Any Size! канала MindYourDecisions
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