If this is the case with an isosceles triangle then it forms an obtuse-angled triangle too. Is an isosceles triangle an example of an obtuse-angled triangle? – The basic rule for an obtuse angle triangle is that at least one angle should be greater than 90-degrees.For this purpose, you must be sure of the properties of the different type of triangles and check them one by one to satisfy a particular condition. If all three angles of an isosceles triangle are less than 90-degree then it forms an acute-angled triangle otherwise not. It is unlike an equilateral triangle where we can use any vertex to find out the altitude. ![]() Since the short legs of an isosceles triangle are the same length, we need to. Area of Isosceles Triangle Formula Definition of Isosceles Triangle: An isosceles triangle is a triangle with two sides of equal length and two equal internal angles adjacent to each equal sides.
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