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 Feb 6, 2017
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The tip of the kite is bisected by the vertical rib so angle 1 = 39 degrees   (two right triangles with equal leg and hypotenuse  must be equivalent)

angle three is in a right triangle where two of the angles are 90 and 39      180 - 90 - 39 = angle 3 = 51 degrees

 Feb 6, 2017
edited by ElectricPavlov  Feb 6, 2017

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