Three interconnected rods form a 90-45-45 triangle that reside on the plane x′y ′ of frame O. The chord of this triangle is in the direction of the x-axis. The frame O in the x direction moves away from the frame O at a speed of 0.6c. What are the angles of this triangle from the observer O's point of view (in degrees)?

Three interconnected rods form a 90-45-45 triangle that reside on the plane x′y ′ of frame O. The chord of this triangle is in the direction of the x-axis. The frame O in the x direction moves away from the frame O at a speed of 0.6c. What are the angles of this triangle from the observer O's point of view (in degrees)?