SAT Math Review Equation of a Circle

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This is an SAT math Problem on the no calculator portion of the test. It is also a review of the equation of a circle
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My thought approach was using the distance formula to using the endpoint an center to find the length for radius

Greengales
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After finding the LHS you could simply put in the values at the endpoint and you would get the answer for r

BaldricOfTalos
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Didn’t know how these equations work, but still got it correct, because I thought there aren’t any negative numbers, so, this would automatically eliminate the answers with the plus in there (I used to reference-deduce here, because I know that functions in equations in parenthesis like this one: f(x)=3x+(x-3) automatically have the inverted sign, this means it’s a positive 3 standing in parenthesis).

After that I just plugged the numbers in, because I still know a bit about equations 😂, calculated them and deduced that A must be the correct answer.

Kind of proud of myself

sonicmaths
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Can you review the most difficult question asked in an SAT

mikulramesh
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Wouldn’t it be C since it’s simplified?

jonathanwu