1.A ship sees a lighthouse which is found to be 9.8 km distant through the use of radar. The lighthouse is 3km from a second lighthouse. The angle between the line of sight between the two lighthouses is 30°. What is the angle between the line of sight between the ship and lighthouse 2, when looking from lighthouse 1?
2.In a triangle ABC, side a is 18cm long, side b is 10cm long and angle B is 89°. What is the measure of angle A?