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| Introduction |
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Triangles are classified on the basis of the lengths of their sides as scalene, isosceles, or equilateral triangles. When any two sides of a triangle are equal it is called as an "isosceles triangle". The unequal side is called its base and the angle opposite the base is called the "vertical angle". In  if AB = AC, it is an isosceles triangle, BC is its base and  is its vertical angle. |
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