6 thoughts on “Some more useful triangles

  1. Hi bro,

    Could you please elaborate the similarity property of ABC and DBC triangles in last golden triangle ? How are they similar ? Side common, one angle common, Min two angles are required na.

    • Raeez, the common side has nothing to do with it. The smaller triangle has 1 angle common (72 degrees) and one angle 36 because it is bisecting the other base angle of the large triangle (which is 72). So it is also a 36-72-72 triangle.


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