The given polygon is a right, scalene triangle. Use a congruent triangle to form a quadrilateral. A scalene triangle. The side lengths are 5 and 9, and the hypotenuse length is unknown. Imagine using two of these triangles to construct a figure. What are the characteristics of the figure? Select all that apply. It’s a rectangle. Opposite sides are congruent. All sides are congruent. Opposite sides are parallel. All angles are right angles.