A trigonometric result named for this man concludes that a triangle is a right triangle if its three end points are on a circle, and that two of them form a diameter.
This man was the first to measure the height of the Egyptian pyramids by counting the time lapse between noontime and the time the pyramid's shadow was his own height. According to Diogenes Laertius he is the source of the apothegm "know thyself." A trigonometric result named for this man concludes that a triangle is a right triangle if its three end points are on a circle, and that two of them form a diameter. More famously, this predecessor to Anaximenes and Anaximander, was a member of the Seven Sages that is held to be the first to predict a solar eclipse. For 10 points, name this pre-Socratic thinker that suspected water was the first cause of the world.
This man was the first to measure the height of the Egyptian pyramids by counting the time lapse between noontime and the time the pyramid's shadow was his own height.
{Thales} of Miletus