To drive to the store from home, somebody first travels 5 km west, then they travel 5 km northwest. What is the straight line distance between their home and the store?
straight line distance between their home and the store can be solve using cosine law. first is solve the angle which is180 - 45 = 135 degree C^2 = a^2 + b^2 - 2ab cos(135)c^2 = 5^2 + 5^2 - 2(5)(5) cos(135)c^2 = 85.35c = 9.24 km is the straight line distance between their home and the store
