The right triangle has one 90 degree angle and two acute (< 90 degree) angles. Since the sum of the angles of a triangle is always 180 degrees... y + z = 90 degrees. The two sides of the triangle that are by the right angle are called the legs... and the side opposite of the right angle is called the hypotenuse.
They were called the Hollywood 10 and accused of being communist. I don't think you would find many people who can name them all.
Following Mao's death in 1976, a brief political struggle ensued between Jiang's Gang of Four and Hua Guofeng. The Gang of Four was ultimately arrested and they were politically discredited. All four members were held responsible for the upheaval and suffering wrought by the Cultural Revolution and they were placed on trial. Jiang and Zhang were sentenced to death, although their sentences were later commuted to life imprisonment. Yao and Wang were sentenced to long terms of imprisonment.