Therefore, = / −, = / − / , and so, in particular, < . That means side AD opposite angle α is shorter than side AB opposite the larger angle β. In the isosceles triangle ABC, AB = AC. Also, the angles opposite these equal sides are equal. The third side is called the base. See more. In an isosceles triangle, the height that is drawn from the apex divides the base of the triangle into two equal parts and the apex angle into two equal angles. isosceles triangle synonyms, isosceles triangle pronunciation, isosceles triangle translation, English dictionary definition of isosceles triangle. Isosceles triangle is also known as iso-angular triangle too, because they have two angles that have the same size (congruent). Congruent angle. I believe it takes either 3 points to define a triangle, or 2 points and an angle, allowing the third point's co-ordinates to be calculated using trigonometry. An isosceles triangle ABC is constructed with equal sides AB = AC. In geometry, an isosceles triangle is a triangle that has two sides of equal length. The base, leg or altitude of an isosceles triangle can be found if you know the other two. isosceles triangle definition: 1. a triangle with two sides of equal length 2. a triangle with two sides of equal length 3. a…. Because the legs are of equal length, the base angles are also identical. This fact is the content of the isosceles triangle theorem, which was known by Euclid. Likewise, in the isosceles triangle ABC, the angles satisfy: + = . An isosceles triangle has two sides that are the same length and one side that is a different length. ‘First construct an isosceles triangle whose base angles are double the vertex angle.’ ‘This is the ‘alternate’ solution to constructing the isosceles triangle with the base of the square as one side, using only a straightedge.’ ‘The base of the wedge is an isosceles right triangle in a vertical plane.’ Origin. The two equal sides are marked with lines and the two equal angles are opposite these sides. The isosceles triangle is a type of triangle, which has two sides with the same length. The angle between the two legs is the vertex, and the angles by the base are called base angles. But AB = AC. 3. The angles opposite to equal sides are equal in measure. Parts of an Isosceles Triangle. Considering the attached image, is that possible to compute for $\angle x$ in the isosceles triangle below, with no further known values? The two angles adjacent to the base are called the base angles, while the angle opposite the base is called the vertex angle. An isosceles triangle is a triangle that has (at least) two equal side lengths. Define isosceles triangle. The side view of an object is dra An equilateral triangle is, however, a special case of an isosceles triangle, having all three sided equal. The figure shows an isosceles triangle ABC with