Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
Find the distance of each point from the origin.
The distance between and is . From the origin it is .
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a). units.
Step 2. (b). units.
Step 3. (c). units.
Answer: , and units.
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