AAA Theorem
Specifying three Angles 
, 
, and 
does not uniquely define a Triangle, but any twoTriangles with the same Angles are Similar. Specifying two Anglesof a Triangle automatically gives the third since the sum of Angles in a Triangle sums to180° (
Radians), i.e.,
See also AAS Theorem, ASA Theorem, ASS Theorem, SAS Theorem, SSS Theorem,Triangle
- Dihedral Angle
- Dihedral Group
- Dijkstra's Algorithm
- Dijkstra Tree
- Dilation
- Dilemma
- Dilogarithm
- Dilworth's Lemma
- Dilworth's Theorem
- Dimension
- Dimensionality Theorem
- Dimension Axiom
- Dimension Invariance Theorem
- Diminished Polyhedron
- Diminished Rhombicosidodecahedron
- Dini Expansion
- Dini's Surface
- Dini's Test
- Dinitz Problem
- Diocles's Cissoid
- Diophantine Equation
- Diophantine Equation--10th Powers
- Diophantine Equation--5th Powers
- Diophantine Equation--6th Powers
- Diophantine Equation--7th Powers