Congruence CriteriaHigh School · Geometry · HSG-CO.B.8, HSG-CO.B.7
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High School · Geometry · Arcade · Ages 14–18

Congruence Criteria

Maths standardHSG-CO.B.8HSG-CO.B.7Explain how ASA, SAS and SSS (and AAS) follow from rigid motions — and why SSA and AAA are not enough.

  1. Ticks show equal sides; arcs show equal angles.
  2. Check if the marked angle sits BETWEEN the marked sides.
  3. SSA and AAA don’t prove congruence.
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