If you are talking about the triangle: An isosceles triangle has two sides of equal length. Sometimes it is specified as having two and only two sides of equal length, and sometimes as having at least two sides of equal length. If you are talking about the trapezoid (or trapezium):
The Marquis de Lafayette at Valley Forge. The Marquis de Lafayette, who joined the Continental Army at age nineteen in the summer of 1777 as a volunteer Major General, spent most of December 1777 and January 1778 with George Washington and his Continental Army troops at their winter quarters at Valley Forge. During that long, harsh winter, the ill-equipped Americans suffered in many ways.
After he trained further at Metz in 1775, he met the Comte, who became a great influence in his life. Comte de Broglie, who was secretly supporting the revolutionary American army from the beginning, invited young Marquis de Lafayette to join the Freemasons society.