- 直角三角形 zhíjiǎosānjiǎoxíng right triangleright-angled triangle
- 直角坐标 zhíjiǎozuòbiāo rectangular coordinatesrectangular coordinates; Cartesian coordinates
- 直角尺 zhíjiǎochǐ set squarea set square; an L-shaped or triangular tool used for drawing or testing right angles
- 直角器 zhíjiǎoqì set squarea tool used for drawing or checking right angles, such as a set square or a carpenter's square
- 笛卡尔直角坐标 díkǎ'ěrzhíjiǎozuòbiāo Cartesian coordinatesCartesian rectangular coordinate system
