ΔQRS and ΔXYZ are two right triangles. The hypotenuse of each triangle is 10 cm long; m∠R = 55° and m∠Y = 35°.

Which of the following best describes the two triangles?

The two triangles are similar because they both have a right angle and they share a common angle (angle R and angle Y). Since the hypotenuse of each triangle is the same length, the triangles are similar by the Angle-Angle (AA) similarity criterion.