1)
In ∆ABC,
Using the law of sines,

where,
- a = 8cm
- b = ?
- Sin A = Sin 35
- Sin B = Sin 80






hence , Side AC = 13.8cm.
In ∆ ACD ,
Using the law of sines,

where,
- a = x
- b = 13.8cm
- Sin(A) = Sin 75
- Sin(B) = Sin 60






Hence, the value of x would be equal to 15.4cm .