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WAEC 2020 · Paper 1 · Q45

Which of the following is not a sufficient condition for two triangles to be congruent?

Worked solution (try it first)
  1. SSS, SAS (the angle between the two sides) and AAS each fix a triangle completely, so they prove congruence.
  2. In SSA the angle is not between the two sides.
  3. The third side can swing to two positions, so two different triangles can fit the same data.
  4. So SSA is not a sufficient condition, option D.

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