Asked by Hannah

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?
Answered by R_scott
130 km north, and 30 km east ... use Pythagoras ... a^2 + b^2 = c^2
Answered by Hannah
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.
Answered by henry2,
All angles are measured CW from +y-axis.
D = 70 + 30i + 60 = 130 + 30i.
D = sqrt(130^2 + 30^2) =
Answered by Hannah
Thank you very much!