Proof: Sum of measures of angles in a triangle are 180 | Geometry | Khan Academy
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Proof: Sum of measures of angles in a triangle are 180 | Geometry | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/math/geometry/hs-geo-congruence/hs-geo-congruence-theorems/v/proof-sum-of-measures-of-angles-in-a-triangle-are-180 Proof that the sum of the measures of the angles in a triangle are 180 Watch the next lesson: https://www ...
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