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# C1!!! Help pls watch

1. How to prove a point is the origin?ii
2. (Original post by CorpusLuteum)
How to prove a point is the origin?ii
I'm assuming it's part A??

Just get it in the form and show that a=4 and b=2
3. (Original post by RDKGames)
I'm assuming it's part A??

Just get it in the form and show that a=4 and b=2
It's part 2; I've already worked out the radius=square root 29 but it says show that (4,2) is the origin inside the circle
4. (Original post by CorpusLuteum)
It's part 2; I've already worked out the radius=square root 29 but it says show that (4,2) is the origin inside the circle
If any point is inside a circle then the distance between that point and the origin of the circle must be less than the radius.
5. Make one zero to remove a term (à or b) then do the other one. By substituting in values of a or b that cancel out in the circle.
6. (Original post by RDKGames)
If any point is inside a circle then the distance between that point and the origin of the circle must be less than the radius.
How would you show that though?
7. (Original post by CorpusLuteum)
How would you show that though?
I just told you. Show that the distance between the origin and the centre of the circle is less than the radius by doing some Pythagoras - though you can skip the set up if you can notice that the form is essentially Pythagoras's for distance between a point (x,y) and (4,2), so just plug (0,0) into that and square root it. It should less than the radius.
8. mmm...looks a bit challenging...but will find a way :P
(Original post by CorpusLuteum)

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