A square is a special type of quadrilateral where all four sides are equal in length. Therefore, the correct answer is "quatro lados com mesma medida" which means "four sides with the same length" in English.

A square is a special type of quadrilateral that has four equal sides and four equal angles. Therefore, all four angles in a square have the same measure.

A hexágono is not a quadrilateral because a quadrilateral is a polygon with four sides. A hexágono has six sides, so it does not fit the definition of a quadrilateral.

A losango é um quadrilátero com quatro lados, mas ao contrário de um quadrado ou retângulo, não necessariamente possui todos os lados com a mesma medida. Portanto, a afirmação correta é que o losango possui quatro lados com a mesma medida.

A resposta correta é "fechada e limitada por segmentos de retas que não se cruzam". Para ser considerado um polígono, a figura geométrica plana precisa ser fechada, ou seja, não ter aberturas ou buracos. Além disso, os segmentos de retas que formam o polígono não devem se cruzar, garantindo que a figura seja composta por lados distintos e não sobrepostos.

An equilateral triangle is a special type of triangle where all three sides have the same length. Therefore, the correct answer is "todos os lados com mesma medida" which means "all sides have the same length" in English.

The correct answer is "trapézio" because a trapezium is the only polygon among the options that does not have two pairs of parallel sides. A losango (rhombus) has opposite sides that are parallel, a quadrado (square) has all four sides that are parallel, and a retângulo (rectangle) has opposite sides that are parallel. However, a trapézio (trapezium) has only one pair of parallel sides. Therefore, it does not represent a paralelogramo (parallelogram).

A rectangle is a quadrilateral with four right angles. In a rectangle, all four angles have the same measure, which means they are all right angles. Therefore, the correct answer is "quatro ângulos com mesma medida" which translates to "four angles with the same measure."

A regular polygon is a polygon that has all sides and angles equal. Therefore, all sides of a regular polygon have the same measure.

A parallelogram is a quadrilateral where the opposite sides are both parallel and congruent.

A square is a special type of rectangle because it has all the properties of a rectangle, such as having four right angles and opposite sides that are parallel and equal in length. Additionally, a square also has the property of having all sides equal in length, which makes it a special type of rectangle called a square. Therefore, a square is both a square and a rectangle.

The correct answer is "dois lados opostos paralelos e outros dois lados opostos não paralelos." This statement accurately describes a trapezoid, as it has two opposite sides that are parallel and two opposite sides that are not parallel.