A boat sails due north from the port 70 km, then 30 km east and then 60 km north. How far is the boat from port?

Answer 1

130 km north, and 30 km east ... use Pythagoras ... a^2 + b^2 = c^2

Answer 2

Hi can I ask what letter should I needed to find? If it is a b or c? I really didn't get it. Thank you very much.

Answer 3

All angles are measured CW from +y-axis.
D = 70 + 30i + 60 = 130 + 30i.
D = sqrt(130^2 + 30^2) =

Answer 4

Thank you very much!