A)
cosβ=a/ccos\beta=a/ccosβ=a/c
a=c⋅cosβa = c ⋅ cos\betaa=c⋅cosβ
a=10⋅cos65°=4.23feeta = 10 ⋅ cos 65° = 4.23 feeta=10⋅cos65°=4.23feet
B) a = 180 - 20 = 160 feet
α=40°\alpha=40°α=40°
sinα=a/csin\alpha = a/csinα=a/c
c=a/sinαc=a/sin\alphac=a/sinα
c=160/sin40°=248.92feetc=160/sin40° = 248.92 feetc=160/sin40°=248.92feet
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