- 直角三角形 zhíjiǎosānjiǎoxíng right triangleright-angled triangle
- 正三角形 zhèngsānjiǎoxíng equilateral trianglea triangle where all three sides and all three interior angles are equal
- 二等边三角形 èrděngbiānsānjiǎoxíng isosceles trianglea triangle with at least two sides of equal length
- 帕斯卡三角形 pàsīkǎsānjiǎoxíng Pascal's triangle(math) Pascal's triangle; a triangular array of numbers where each number is the sum of the two directly above it
- 平面三角形 píngmiànsānjiǎoxíng plane trianglea triangle that exists within a two-dimensional plane
- 等腰三角形 děngyāosānjiǎoxíng isosceles trianglea triangle with at least two equal sides
- 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]].
- 等边三角形 děngbiānsānjiǎoxíng equilateral trianglea triangle with three sides of equal length
- 不等边三角形 bùděngbiānsānjiǎoxíng scalene trianglea triangle where all three sides have different lengths
- 不规则三角形 bùguīzésānjiǎoxíng scalene trianglea triangle in which all three sides have different lengths; scalene triangle
