You can calculate the inner angle for station A by subtracting 87° to 180 (as the ground is a flat angle).Then, you can deduct the third angle in the triangle by subtracting (87°+84.2°) to 180° (as the sum of all angles in a triangle is 180°).To answer question a, you just have to use the law of sines.For question b), you can draw a line from the satellite that forms a right angle with the ground.You have a third triangle, and can use the same reasoning to get the height from the ground.
(as the ground is a flat angle)
48 / 2(9+3) =What is the answer?