## Smaller than the Smallest Angle (formed by straight lines)

The angle a tangent line forms with the circumference of a circle is is least possible angle made with a straight line from that point of tangent (tangent line EA in the image). This is demonstrated in Book III, proposition 16 of Euclid’s Elements. The angle formed by the tangent is also known as a cornicular or … Continue reading Smaller than the Smallest Angle (formed by straight lines)