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anonymous

  • one year ago

Points A(−1, 2), B(−2, −5) and C(7, −2) are on a circle. What is the area of the circle? Express your answer as a decimal to the nearest tenth.

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  1. anonymous
    • one year ago
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    1. slope of AB 2. mid point of A,B 3. slope of line perpendicular to AB 4. eq. of line (perpendicular bisector) through mid point 5. similarly find the eq. of perpendicular bisector of BC 6. center is point of intersection of perpendicular bisectors (say O) 7.find r=OA 8. area of circle.

  2. anonymous
    • one year ago
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    \[slope=\frac{ y _{2}-y _{1} }{ x _{2} -x _{1}}\]

  3. anonymous
    • one year ago
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    mid point\[=\left( \frac{ x _{1} +x _{2}}{ 2 } ,\frac{ y _{1} +y _{2}}{ 2 }\right)\]

  4. anonymous
    • one year ago
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    can you help me i dont know what you are talking about can you give me the answer too @surjithayer

  5. anonymous
    • one year ago
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    first find the slope of AB by the above formula and show me.

  6. anonymous
    • one year ago
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    \[m=\frac{ -5-2 }{ -2-(-1) }=\frac{ -7 }{ -2+1 }=\frac{ -7 }{ -1 }=7\] slope of line perpendicular to AB=-1/m=-1/7

  7. anonymous
    • one year ago
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    mid point of A,B

  8. anonymous
    • one year ago
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    will you show me ?

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