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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 ... Discover the core properties of isosceles triangles , learn formulas, and solve typical questions with easy diagrams and proofs—perfect for board and competitive exams. The word isosceles is pronounced "eye- sos -ell-ease" with the emphasis on the 'sos'. It is any triangle that has two sides the same length. If all three sides are the same length it is called an equilateral triangle . Obviously all equilateral triangles also have all the properties of an isosceles triangle . Properties The unequal side of an isosceles triangle is usually referred to as the 'base' of the triangle . The base angles of an isosceles triangle are always equal. In the figure above ...
