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It has to have at least 2 congruent angles and/or sides to be isosceles. Therefore, an equilateral angle would be isosceles.
If its in the form of an isosceles right angle triangle then it will have 2 equal sides.
the top angle the angle formed by the two congruent sides
An isosceles triangle is a triangle that has two sides of equal length. A right triangle has an interior angle of 90 degrees. A right isosceles triangle has both characteristics. The 90 degree angle will be the angle formed by the sides of equal length.
What kind of isosceles? A isosceles triangle has 3 sides, while a isosceles trapezoid has 4 sides. Hope i helped:)