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Look at the figures. How can you prove these triangles are congruent? ∆ABC ≅ ∆DEF by the SAS Postulate. ∆ABC ≅ ∆DEF by the SSS Postulate. It is not possible to determine if the triangles are congruent.
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Look at the figures. How can you prove these triangles are congruent?

∆ABC ≅ ∆DEF by the SAS Postulate.

∆ABC ≅ ∆DEF by the SSS Postulate.

It is not possible to determine if the triangles are congruent.

Look at the figures. How can you prove these triangles are congruent? ∆ABC ≅ ∆DEF-example-1
User Bitswazsky
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It is not possible to determine if the triangles are congruent

by SSS, you need to know AC=DF, but there is no way to know it.

by SAS, you need to know ∠ABC=∠DEF, no way to know as well.
User Max Semikin
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