A NEW class-book on Practical Geometry commends itself to our attention. Mr. John Palliser, of the Leeds School of Art and Science, has produced one of those educational works which a demand created ...

OK, I have a triangle with vertices at points A, B and C. The distance from A to B is 78.23'. BC distance is 30.90'. The angle between these two sides, ABC, is 143 ...

In the third century BCE, Apollonius of Perga asked how many circles one could draw that would touch three given circles at exactly one point each. It would take 1,800 years to prove the answer: eight ...