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2013-04-21T23:56:01+02:00

A/
2) HE² = HI² + IE² = (HD - AE)² + AD² = 3² + 5.0625 = 14.0625
      HE = 3.75
3) cos(IHE) = HI/HE = 3/3.75
      IHE = 37°