直角三角形 zhíjiǎosānjiǎoxíng right triangle Origin Definitions Defs Strokes Stroke Words Sentences Sents 直角 zhíjiǎo noun right angle an angle of 90 degrees formed by two lines or surfaces that are perpendicular to each other三角形 sānjiǎoxíng noun triangle three-sided shape in geometry; also describes things with a similar shape, such as a delta