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 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.
A Scalene triangle has no sides of equal length.
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".
It is an equilateral triangle that has 3 equal sides.
isosceles