Question

write a counterexample to show that the conjecture is false. if a figure has four sides, then it is a rectangle.

Explanation:

Step1: Recall the properties of rectangles

A rectangle has four - sided with opposite sides equal and all angles equal to 90 degrees.

Step2: Think of a four - sided figure without these properties

A rhombus has four sides, but its angles are not all 90 degrees.

Answer:

A rhombus (a four - sided figure with all sides equal but angles not all 90 degrees) is a counterexample.