cyclone distance
Shortest Distance from Hong Kong
Point A and point B show where a cyclone enter and leave the 800km circle that centred at Hong Kong (point O). The distance between A and B is 1200km. What is the shortest distance of the cyclone from Hong Kong?
This will initiate some discussion about the meaning of shortest distance and how to identify it, leading to analysis of a chord. You may move A and B to create another chord of the same length and discuss what will be the same.
Drag the slider d to see how the cyclone C is moving. On the left, represents the length of AB in km.