Winkel
A-D-B = 180 -45 = 135 °
A = 30 °
A-B-D = 180 - 30 - 135 = 15 °
Sinussatz
sin(gamma) / 10 km = sin(alpha) / ( D-B)
sin(135 ) / 10 = sin(30) / ( D-B )
( D - B ) = 10 * sin(30) ( sin(135)
( D - B ) = 7.071 km
sin(15) / ( A-D) = sin(135 ) / 10
sin(15) / sin(135 ) * 10 = ( A-D)
( A - D ) = 3.660
10 + 7.071 + 3.660