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In this article, we will learn the properties and formulas related to the isosceles triangle , in detail, along with examples. What is Isosceles Triangle ? An Isosceles triangle is a triangle that has two equal sides. Also, the two angles opposite the two equal sides are equal. Learn what an isosceles triangle is, how to identify its features, and how to classify it into acute, obtuse, or right. Find out how to calculate its area and perimeter using formulas and examples. An isosceles triangle is a type of triangle in geometry that has at leasttwo sides of equal length. The angles opposite these sides are also equal. Suppose we have any triangle PQR then it is an isosceles triangle if any one of the given conditions is true: PR = QR ∠P = ∠Q In the figure below the Side AC = BC, also ∠A = ∠B making it an Isosceles Triangle . Note: Every equilateral triangle is an isosceles triangle . Real-life Examples of Isosceles triangle : Read More: Real-Life Examples ... Isosceles Triangle : Learn about the types of isosceles triangles , their properties and theorems linked with isosceles triangles along with solved examples.