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Height of a parallelogram and the angle of intersection of heights

Details

height parallelogram

    

    •  , b black      -  sides

         alpha red  -  acute angle

         beta2 blue  -  obtuse angle

       Ha    -  height to the base  

       Hb green    -  height to the base  b black

     

    Find the length of the height of a parallelogram without area if given side and angle  :

    height parallelogram F2

    height parallelogram F1

     

    The acute angle of intersection of the heights is equal to the acute angle of the parallelogram.  :
    The obtuse angle of intersection of the heights is equal to the obtuse angle of a parallelogram.  :