If you are talking about the triangle:
An isosceles triangle has two sides of equal length. Sometimes it is specified as having two and only two sides of equal length, and sometimes as having at least two sides of equal length.
If you are talking about the trapezoid (or trapezium):
In Euclidean geometry, an isosceles trapezoid is a convex quadrilateral with the line of symmetry bisecting one pair of opposite sides.
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if you are meaning a triangle, it means two sides are equal and the other is not.
If you mean isosceles then it is a triangle that has 3 sides of which 2 of its sides are equal in length
If you mean an isosceles triangle then no because all triangles have no diagonals
Isosceles with a Clasical Greek mathematician, who theorised over triangles. Today in his memory we have the Isosceles Triangle, which is a triangle of two equal lengths and two equal angles.
an isosceles triangle is a triangle that means two of the triangles sides have the same length and two angles are the same
If the sloped sides of an isosceles trapezium are extended to a vertex, you would get an isosceles triangle.If the sloped sides of an isosceles trapezium are extended to a vertex, you would get an isosceles triangle.If the sloped sides of an isosceles trapezium are extended to a vertex, you would get an isosceles triangle.If the sloped sides of an isosceles trapezium are extended to a vertex, you would get an isosceles triangle.
If you extend the two legs of an isosceles trapezoid until they intersect, you get an isosceles triangle.