First of all, quadrilaterals are just shapes with 4 sides! The word "quadrilateral" comes from the Spanish word "cuatro" which means four. One shape that has all sides equal length and is a quadrilateral is a square. Another one is a rhombus. Because it has 4 equal sides that are the same length. That easy! I hope this helps!
Most quadrilaterals do not have opposite sides which are equal in length. Sadly, there is no special name for them.
A Scalene triangle has no sides of equal length.
An isosceles triangle has exactly two sides that are equal in length.
It isn't really a square if it has no equal sides. A trapezoid can be drawn that has no equal sides, some can have two sides equal. Quadrilaterals include those 4-sided shapes with no sides equal but they also include all other 4-sided shapes. You would need to specify "Quadrilateral with no equal sides".
An Isosceles Triangle has two sides that are equal in length.* * * * *But, a triangle with no two sides equal (as per the question that was asked), the answer is a scalene triangle.
Most quadrilaterals do not have opposite sides which are equal in length. Sadly, there is no special name for them.
trapezium
A Scalene triangle has no sides of equal length.
A general quadrilateral has no equal sides, but it also has no specific name. Among quadrilaterals with a name, a trapezium (unless it is isosceles) can have no equal sides.
rambus square
An isosceles triangle has exactly two sides that are equal in length.
equal lateral
There is no name for such a figure. Quadrilaterals such as a trapezium or kite or even one with no equal sides can have a right angle.
The name for a triangle with two sides of equal length is an isosceles triangle.
It isn't really a square if it has no equal sides. A trapezoid can be drawn that has no equal sides, some can have two sides equal. Quadrilaterals include those 4-sided shapes with no sides equal but they also include all other 4-sided shapes. You would need to specify "Quadrilateral with no equal sides".
isosceles
It is an equilateral triangle that has 3 equal sides.