New Delhi, Dec. 30 -- Ancient Indian mathematician Baudhayana was the first person to formulate a theorem on right-angled triangles that in its modern form came to be associated with Greek mathematician Pythagoras, a newly released Class 8 mathematics textbook by the National Council of Educational Research and Training says. The textbook uses examples from Indian monuments and cultural contexts to explain key concepts of the subject, including Baudhayana's theorem on right-angled triangles. P6...