AQA Core 1 6.07 The Intersection of a Straight Line and a Circle

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What would you do if you needed to find the radius of the circle but you knew the equation of the line and the centre of the circle?

kianoconnor
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but i don"t understand sth .Why when desciminant is zero or grater/less than zero it has intersection or whatever.what is the relationship logically between descriminant and intersections

orjonmuca
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What if the discriminant is greater than or equal to 0?

joebloor