[photo taken from Mr.H's post]
This man is named Pythagoras. He was a teacher and philosopher in Greece, who was also vegan. Pythagoras was famous for calculating the circumference of the earth and realizing that the earth is a sphere and not flat. Pythagoras discovered the Pythagorean Theorem (a² + b² = c²).
This is the formula for the Pythagorean Theorem.
In this picture is a right triangle. R.A.T [ Right Angle Triangle]. The longest side of the triangle of the triangle is the hypotenuse. [side C= Hypotenuse]. The other two side are called the legs. [ side a & b= legs], and it doesn't matter which lines the letters go on. The legs both equal 90 degree angles. The square in the corner tells you that the lines equal a 90 degree angle. The sign in the corner that looks like a 'B' is called Beta and the sign that looks like a O with a line through it means theta.
This is a quadrilateral square. Quadrilateral means that all the side are the same length. The lines on each side of the chair indicate that each side is equal. In the corners of the square are the squares again, which means the sides make 90 degree angles. All the angles make up 360 degrees, therefore making the square equal 360 degrees.