It is an isosceles triangle with a right angle between the sides of equal length.
Also the equal angles are 45o.
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Take a square, draw one of its diagonals. The shape that is on one side of that diagonal is a right isosceles triangle.
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An isosceles triangle has two same sides and one different side.
It probably is a isosceles triangle
That's called a 45° right triangle. The length of the hypotenuse is equal to the length of each of the other two sides times the square root of two.
It looks like an isosceles triangle with its top cut off by a line parallel to its base.
It has 3 sides