Small Boat Diagram Mathematics(problems Trigonometry)?

Mathematics(problems trigonometry)? - small boat diagram

1) Two ships A and B are set in motion the same point P. A ship moves in a straight line at 20 kmh ^ -1 and B moves in the same boat in a straight line 32 kmh ^ 1 The angles between their paths 70degrees. Calculate the distance between the boats after 2.5 hours.
2) The figure shows a triangle with sides 5cm, 7cm and 8cm.Find a) the size of the smallest angle in degrees.b) area of the triangle.
3) The diagram shows two triangles, so that the conditions AB = 20 cm, BC = 17 cm, angle ABC = 50degrees
a) Calculate the height of the ACB angle in triangle 2
b) Calculate the area of the triangle 1st
4) In the triangle ABC, B = 43degrees, AC = AB = 6.8cm and give the size of a 4.3cm.Find, their reaction to a conclusion.