- 等角三角形 děngjiǎosānjiǎoxíng equiangular triangleA triangle where all three internal angles are equal; same as an [[等边三角形|等邊三角形|deng3 bian1 san1 jiao3 xing2]].
- 等角共轭线 děngjiǎogòng'èxiàn isogonal conjugate linea pair of lines passing through the same vertex of an angle such that they are symmetric with respect to the angle bisector
- 等角线 děngjiǎoxiàn isogonal linea line passing through the vertex of an angle that forms a pair with another line such that they are symmetric with respect to the angle bisector
- 等角航线 děngjiǎohángxiàn rhumb linea line crossing all meridians of longitude at the same angle, representing a course of constant bearing for navigation
- 等角螺线 děngjiǎoluóxiàn equiangular spirala spiral curve that cuts all radial lines from its origin at a constant angle, also known as a logarithmic spiral or rhumb line
