rectangle [rectangles](quadrilateral) noun [UK: ˈrek.tæŋ.ɡl̩] [US: ˈrek.tæŋ.ɡl̩]The opposite sides of a rectangle are parallel. = Los lados opuestos de un rectángulo son paralelos.
triángulo rectángulonoun {m}
right triangle(a triangle having a right angle as one of its interior angles) noun [UK: raɪt ˈtraɪæŋ.ɡl̩] [US: ˈraɪt ˈtraˌjæŋ.ɡl̩]