If, ‘a’ is the length of the equal sides (legs) and ‘b’ is the length of the unequal side (base). According to the isosceles triangle theorem, if two sides of a triangle are congruent, then the angles opposite to the congruent sides are equal. Perimeter of Isosceles Triangle = Sum of Length of two equal sides + Length of the other unequal side Example 1: In the given figure below, find the value of x using the isosceles triangle theorem. The side opposite the vertex angle is called the base and base angles are equal. The two equal sides of an isosceles triangle are called the legs and the angle between them is called the vertex angle or apex angle. The formula to calculate the perimeter of the isosceles triangle is given by: Here is a list of a few properties of isosceles triangles: An isosceles triangle has two equal sides and two equal angles. For this triangle the perimeter can be found using the length of the base and side. The perimeter of a triangle is the sum of the length of all three sides. With the knowledge of anyone angle, the other two angles can be calculated as we know that the sum of angles in a triangle is 180 degrees (as per the properties of triangle).The angle which involves the base of the triangle is known as the ‘base angles’.By default, node center is positioned at the provided coordinates ( (0,0) for previous examples). The angle made by the two equal sides of an isosceles triangle is known as the Vertex angle. Isosceles triangle anchors The advantage of using a node triangle shape is that it defines a set of anchors that we can use them to get coordinates of the node border or to position nodes with accuracy with respect to given coordinates.A right isosceles triangle has a third angle as 90 degrees.The altitude of an Isosceles Triangle is measured from the base to the topmost vertex (angle made by the two legs) of the triangle.The angles opposite to the two equal sides of the triangle is always equal.Two sides of the Triangle are equal and are known as ‘Legs’.Some of the characteristics of Isosceles triangles and the rules are as follows. ∠B = ∠C ≠ ∠A Properties of Isosceles Triangle In the figure above AB and AC are legs and BC is the base. Whereas, the third side (which is not equal to the other two) is called ‘Base’. The two equal sides of the triangle are called ‘Leg’. Let △ABC be an Isosceles Triangle as shown in the image below: In other words, when two sides of a triangle are equal, it is called an Isosceles Triangle. Also, the angle opposite the equal sides is also equal. Isosceles Triangle, a triangle that has two equal sides.
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