SOLUTION: Find the radius of the circle using these three points: (-2,2),(-8,-4),(4,-4)with a center of(-2,-4)

Algebra ->  Circles -> SOLUTION: Find the radius of the circle using these three points: (-2,2),(-8,-4),(4,-4)with a center of(-2,-4)      Log On


   

Question 388041: Find the radius of the circle using these three points: (-2,2),(-8,-4),(4,-4)with a center of(-2,-4)
Found 2 solutions by solver91311, ewatrrr:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


The radius of the circle is the distance from any one of the given points to the given center. Use the distance formula:



which gives the distance between two points and .


John

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Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

radius = -2 -(-8) = 6   Using points Pt(-8,-4) and center Pt(-2,-4)

 Standard Form of an Equation of a Circle is %28x-h%29%5E2+%2B+%28y-k%29%5E2+=+r%5E2

where Pt(h,k) is the center and r is the radius 

 (x+2)^2 + (y+4)^2 = 6^2