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The two equal angles of an isosceles triangle can be any number of degrees between (but not including) 0 and 90 degrees, say y degrees. The third angle would then be (180 - 2y) degrees.
-- Some mathematicians define an 'isosceles' triangle as one with at least twoequal sides. They would say that equilateral triangles are isosceles.-- Other mathematicians define an 'isosceles' triangle as one with exactly twoequal sides. They would say that equilateral triangles are not isosceles.
All you can say about the angles inside every isosceles triangle is: -- Two of them are equal, and they must be acute (less than 90°). -- The third angle must be less than 180° . -- Just as in any other triangle, all three angles add up to 180° .
isosceles triangle is a triangle in which 2 of the 3 sides are equal length. the third side can be any length. there are an infinite number of such triangles. congruent just means total equal to another triangle. you only say congruent when referring to two different triangles. or you can say any triangle is congruent to itself. so if you have two isosceles triangle that are identical, then each one is a congruent isosceles triangle
Not ... exactly. It would be closer to accurate to say that an equilateral triangle is a special case of the isosceles triangle.All equilateral triangles are (also) isosceles; but most isosceles triangles are not equilateral.