Similar Triangles

Lesson · Beginner

Geometry: Plane Geometry

\triangle ABC\sim\triangle A'B'C'

\text{(AA)}\qquad \angle A=\angle A',\qquad \angle B=\angle B'

\text{(SAS)}\qquad \angle A=\angle A',\qquad \frac{AB}{A'B'}=\frac{AC}{A'C'}

\text{(SSS)}\qquad \frac{AB}{A'B'}=\frac{AC}{A'C'}=\frac{BC}{B'C'}