Which one of the following ancient greeks made great advances in the field of mathematics? . herodotus. pythagoras *. praxiteles. plato

The one who made a contribution to the field of Mathematics is Pythagoras. He created the Pythagorean Theorem which states that the square of a hypotenuse in a right angled triangle (90 degrees) is equal to the sum of the squares of the remaining two sides of the triangle. The equation is... 

a^2 + b^2 = c^2 (Read as "a squared plus b squared is equal to c squared)

Pythagoras is your answer. He invented the Pythagorean theorem and was an excellent mathematician.