PSAT 1.8 Math Narrative Walkthrough. Which description of a circle corresponds to the equation?

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answers Okay so we're looking for the description of a

circle This is important stuff Because of a circle ever

hijacks your car you'll want to be able to give

a clear description Otherwise he might just roll free Were

given an equation X plus two squared Plus why Plus

three great design Yeah Kind of like that princes and

were tasked with finding the answer choice that accurately describes

that circle But we don't see anything about hair eye

color here so probably need you bit of math Unfortunately

not too much though because if we know the standard

equation of a circle and hopefully we dio then this

problem is a snap Here it is X minus h

squared plus y minus k squared equals r square Well

gee golly will occurs That looks an awful lot like

our equation already So we really don't have to do

Too much with it Since the center of a circle

is represented by the point h k in the standard

equation we just have to look at the numbers in

our equation and see how they line up while the

two here is our age And the three here is

rk But notice that there are a couple minus signs

in the standard equation meaning we'll have to change the

signs on our numbers to making the center of the

circle negative too negative Three now for the radius which

is the number on the other side of the equal

sign But the radius isn't r squared it just plain

old are so we'll need to reverse the operation here

Taking the square root of nine You get three just

to make sure we can plug everything back into the

standard equation and yep checks out there we go there

to describe this circle We'd say it has a center

located at point Negative Too Negative three with a radius

of three But looks like answer choice d already beat

us to it Special warning to all you rectangles out

there Unfortunately you're the number one target of thieving circles

If you leave your vehicle unattended there's a good chance 00:02:00.402 --> [endTime] That will be a polygon sixty seconds Oh nelly