The Battle of Fredericksburg was fought December 11â15, 1862, in and around Fredericksburg, Virginia, between General Robert E. Lee 's Confederate Army of Northern Virginia and the Union Army of the Potomac, commanded by Major General Ambrose Burnside.
In an isosceles triangle that has exactly two equal sides, the equal sides are called legs and the third side is called the base. The angle included by the legs is called the vertex angle and the angles that have the base as one of their sides are called the base angles.
An equilateral triangle is isosceles because it has three equal sides and an isosceles must have two, which an equilateral does. However, an isosceles has 2 equal sides and therefore is not an equilateral because an equilateral must have 3 equal sides. Simply: an equilateral triangle is an isosceles triangle because 3 is greater than or equal to 2 and an isosceles triangle is not an equilateral triangle because 2 is not greater than or equal to 3. Hope this helps.