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# circle question gcse watch

1. Could someone talk me through this, thanks.
https://media.discordapp.net/attachm...512&height=682
2. State the question .....
3. (Original post by Ex-pert)
State the question .....
**** sorry, edited
4. I haven't done circles in a while but I would find the equation of the circle. To do that, calculate the distance between A and B using the distance formula.
√(x2 - x1)² + (y2 - y1)². Now you have the diameter, determine the radius. After that, you can find the eq. of the circle of the form:
(x - a)² + (y - b)² = r² where r is the radius, and a and b are the components of one of the coordinates. Now you have the equation, you can sub in y = 0 and solve for x, now you have p. You should have two values of p, one negative and one positive (should be clear from the graph).

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Updated: October 21, 2017
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