From a point P, R is 5km due west and 12km due south. Find the distance between P and R
A.
5km
B.
12km
C.
13km
D.
17km
Correct answer is C
Using Pythagoras theorem
\(|PR|^2=|PO|^2+|OR|^2\\
|PR|^2=5^2+12^2\\
|PR|=\sqrt{25+144}=\sqrt{169}=13km\)