Draw a triangle, any triangle (although it may be best to start with an acute triangle). I will instruct you...
Continue reading...easy
Mind-Reading Number Trick
Think of a number, any positive integer (but keep it small so you can do computations in your head). 1....
Continue reading...Rental Harmony
You and your college friends decide to rent a house together, and the N of you have found a house...
Continue reading...Buffon Needle Problem
A plane is ruled with parallel lines 1 cm apart. A needle of length 1 cm is dropped randomly on...
Continue reading...Formula for Primes?
Is there a nice cozy formula that will always spit out primes? Try this one: f(n) = n2 + n +...
Continue reading...Binary Card Trick
You put a deck of cards in your pocket, and invite anyone in the audience to call out a number between 1...
Continue reading...Four Color Theorem
Are four colors always enough to color any map so that no two countries that share a border (in more...
Continue reading...Right Double Cone
Take a solid cylinder of radius R and height 2R. Remove the right “double cone” which passes through the center...
Continue reading...Wallis’ Formula
Here’s a fun formula for Pi involving an infinite product, known as Wallis’ Formula: (Pi/2) = (2*2)(4*4)(6*6)/(1*3)(3*5)(5*7) It is somewhat surprising that...
Continue reading...Conic sections
The conic sections are formed by taking flat slices of a solid double right cone. You can generate them with...
Continue reading...