Question

question 3 of 27 what makes a trapezoid an isosceles trapezoid? a. its legs are congruent. b. its bases are congruent. c. its bases are parallel. d. its opposite angles are congruent.

Explanation:

To determine what makes a trapezoid isosceles, recall the definition: An isosceles trapezoid is a trapezoid (a quadrilateral with one pair of parallel sides, called bases) where the non - parallel sides (legs) are congruent.

• Option B: Bases of a trapezoid are parallel, but congruent bases are not the defining feature of an isosceles trapezoid.
• Option C: Having parallel bases is a property of all trapezoids, not just isosceles ones.
• Option D: Opposite angles being congruent is a property that follows from the legs being congruent, but it is not the defining characteristic.
• Option A: The legs (non - parallel sides) being congruent is the defining property of an isosceles trapezoid.

Answer:

A. Its legs are congruent.