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How to Use the Golden Ratio

The golden ratio is a famous geometry idea with a connection to ancient Greece. (When it came to mathematics, physics, astronomy, philosophy, drama, and the like, those ancient Greeks sure did kick some [more…]

The Geometry of Projectile's Motion

Projectile motion is the motion of a “thrown” object (baseball, bullet, or whatever) as it travels upward and outward and then is pulled back down by gravity. The study of projectile motion has been important [more…]

How to Determine the Earth's Circumference

You can figure out the earth's circumference using a geometric formula that's over 2,000 years old! Contrary to popular belief, Christopher Columbus did not discover that the Earth is round. Eratosthenes [more…]

How to Determine the Distance to the Horizon

Even before Columbus sailed across the Atlantic Ocean (thus “proving” the Earth was round), mathematicians had already developed a very simple formula to calculate the distance to the horizon. Although [more…]


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