Lito walks 3 km north and then 4 km east. How far is he from his starting point?
Correct answer: D. 5 km
His path forms a right triangle with legs of 3 km and 4 km. By the Pythagorean theorem, the distance is √(3² + 4²) = √25 = 5 km, to the northeast of the start. Adding the legs (7 km) gives the distance walked, not the distance from the start.
easy