Tool: Proportion Solver
For △ABC ~ △DEF, the proportion AB/DE = BC/EF always holds. Fill in any three lengths — leave one blank — and solve.
AB / DE = BC / EF
Leave exactly one box empty to solve for it. Fill all four to check consistency.
AB / DE
=
BC / EF
Diagram
Correspondence: A↔D, B↔E, C↔F.