A 306090 triangle always has the same proportions for its sides. Oh, and those numbers refer to the angles in triangles—not to their ages. Although the idea of three generations of triangles is pretty cute. We bet Grandpa Triangle would have some real good stories to tell.

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Triangles 
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Special Right Triangles 
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SOHCAHTOA 
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Proving Triangles Congruent 
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Centers of a Triangle 
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SSS Postulate 
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SAS, ASA, AAS 
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Proving Triangles Congruent 2