In the study of circular functions, the unit circle plays a central role in linking angles with trigonometric values. By defining sine, cosine, and tangent in terms of coordinates on a circle of ...

The waist-to-hip ratio (WHR) measures the ratio of your waist circumference to your hip circumference. It can help determine how much fat is stored on your waist, hips, and buttocks. The waist-to-hip ...

Compounding increases savings exponentially by reinvesting earnings. Calculate compounding on a lump sum using initial amount, rate, and time. Long-term investing significantly amplifies the end value ...

An age-old problem known as squaring the circle stumped mathematicians for more than 2,000 years. During that time, professionals and amateurs alike unknowingly published thousands of false proofs ...

The radius of a circle or a sphere is the distance between the center and the edge. The radius can be used to calculate a circle's diameter, area and circumference. Likewise, a sphere's volume is ...

Many companies deposit paychecks directly into employee accounts on a biweekly basis. For full-time employees, companies calculate these biweekly amounts on the employees' annual salaries. For ...

Scientific American is part of Springer Nature, which owns or has commercial relations with thousands of scientific publications (many of them can be found at www ...

Though they're not a primary mode for travelers, trains are essential. In the 200 or so years they've existed, they've been used to handle a variety of tasks and have become vital all over the globe.

We’ve managed to discover quite a lot about our Universe from our relatively limited vantage point here on Earth. Many of those discoveries have been worthy of nothing more than an updated entry in ...

On Pi Day (March 14), NASA reminded us why we need only a small slice of the irrational number's infinite decimal places to explain most of the known universe. When you purchase through links on our ...

In geometry, the circle is a fundamental shape that holds immense importance. Central to a circle’s properties is its radius – the distance from its center to any point on the circumference. Knowing ...