
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 area $A$ of a circle with radius $r$ is $ A = \pi r^2$. Note that $2r = d$. This is how…

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, 11, 13, 17, 19, and 23. Prime numbers are involved in encryption in today’s technology. Some people think that prime numbers are…

Pythagoras Theorem
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 right triangle. A right triangle has an angle of 90 degrees.