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5 Cards in this Set
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standard circle equation is: |
(x-h)^2 + (y-k)^2 = r^2 |
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what two things do we need to find the equation of a circle with two endpoints? |
we need (h, k) and radius |
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how do we find the radius of a circle using two endpoints? |
convert the two endpoints to midpoint (h, k) format and insert them into the distance formula to find the radius. |
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what is the midpoint formula? |
(h, k) = ( (x1+x2) / 2 , (y1+y2) / 2 ) |
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what is the distance formula? (for finding r?) |
r = √(x1-x2)^2 + (y1-y2)^2 |
