(AM)² = 15²+8²-2*15*8cos60
AM = √(225+64-120)
AM = √(105+64)
AM = √(169)
AM = 13 units.
(13/sin60) = (8/sina)
a = 32.20422750397°
Where a is angle BAM.
b = 90-32.20422750397
b = 57.79577249603°
Where b is angle DAM.
Therefore, calculating DM.
(DM)² = 13²+11²-2*13*11cos57.79577249603
DM = 11.72943003449 units.
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