You might not think that the properties of a triangle would be particularly helpful in the realm of Tootsie Pop lickology. But boy, would you be wrong.

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SSS Postulate 
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SAS, ASA, AAS 
Up Next:
Proving Triangles Congruent 2 
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Properties of Equality and Congruence 
Up Next:
Vertical Angle Theorem 
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Triangle Inequality Theorem 
Up Next:
306090 Triangle 
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Triangles