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.
Isosceles triangle: a triangle with at least two. sides congruent. Scalene triangle: a triangle with no two sides. congruent. Another way to classify triangles is according to their angles. A triangle with three acute angles. can be classified as an acute triangle. A triangle with one obtuse angle can be classified as obtuse triangle.