All  

trigonometry

Stonehenge Sunset impression.

Stonehenge Builders Had Ancient Knowledge of Pythagorean Geometry

A new book, Megalith , claims ancient Britons built Stonehenge “and other stone circles with a knowledge of Pythagoras' theorem, 2,000 years before the Greek philosopher formalized geometry.”...
The 3700-year-old Babylonian tablet with the ‘Pythagorean theorem.’

3700-year old Babylonian Tablet Confirms Pythagoras Did Not Invent the Theorem Bearing His Name

An unknown Babylonian mathematician beat Pythagoras to the discovery of trigonometry by more than 1000 years, claim experts studying the piece. That Babylonian genius marked down the famous theorem...