Problem preview
G-CO.8 Warmup M1-043-A15-V01

Explain ASA, SAS, and SSS triangle congruence criteria from rigid-motion congruence.

Evaluate which congruence criterion is valid and efficient

Problem

For triangles \(ABC\) and \(DEF\) with \(A\leftrightarrow~D\), \(B\leftrightarrow~E\), \(C\leftrightarrow~F\), the marked facts are \(AB\cong~DE\), \(BC\cong~EF\), \(AC\cong~DF\), and \(\angle~B\cong~\angle~E\). Determine every valid congruence criterion formed from exactly \(\text{three}\) marked facts and state each fact set.

Big Picture

What this problem is really about

Because the task asks for every valid three-fact set, treat it as an exhaustive inventory rather than a search for one convenient proof. Omit each marked fact in turn, classify the three that remain, and test both the part types and any included placement against the exact requirements of the standard congruence criteria.

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Four variants of this problem type
Curriculum context
Course
Math I
Standard
G-CO.8
Category
Geometry
Domain
Congruence
Objective
Explain ASA, SAS, and SSS triangle congruence criteria from rigid-motion congruence.
Problem type
Evaluate which congruence criterion is valid and efficient