## Pi

Pi, or $\pi$, is commonly used in the context of circles in geometry. In particular, the circumference $C$ of a circle that has a diameter $d$ is $C = \pi d$. Also, the…

## Prime Number

What is a prime number? A prime number cannot be divided by another number, with the exception of the number 1 and the number itself. Some prime numbers are 2, 3, 5, 7,…

What is the Pythagoras theorem? It is $a^2 + b^2 = c^2$. Here, $a$, $b$ and $c$ are the lengths of a right triangle. Note that $c$ is the hypotenuse of the…