An isoceles triangle.
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equilateral triangle i think
quadrilateral means having all sides the same length. when you make a shape with 3 obtuse angles and with the same length on the sides, only 3 of them will have the same length which is the sides of the 3 obtuse angles. then the last side will be too long. obviously it is no more quadrilateral.
It is an isosceles triangle
a triangle
angles dont have lengths, but degrees. it s an equilateral triangle ( length 3X the same, angle 3X 60°)