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xRAWRRx3

  • 3 years ago

In circle O, m arc BC = 90 and the area of triangle ABC is 18. What is the length of AC?

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  1. xRAWRRx3
    • 3 years ago
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    |dw:1337896626150:dw|

  2. dpaInc
    • 3 years ago
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    triangle ABC is a 45-45-90 triangle. since the area is 18, BC = 6. so AC=6sqrt2 by similarity to the 45-45-90 triangle.

  3. xRAWRRx3
    • 3 years ago
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    how'd you get that BC = 6?

  4. dpaInc
    • 3 years ago
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    you agree that ABC is a 45-45-90 triangle?

  5. xRAWRRx3
    • 3 years ago
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    yup.

  6. dpaInc
    • 3 years ago
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    then this is a square with area 36...|dw:1337897103553:dw|

  7. dpaInc
    • 3 years ago
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    so BC=6

  8. xRAWRRx3
    • 3 years ago
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    ohhh, okay.

  9. xRAWRRx3
    • 3 years ago
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    OHHH. OKAY :) thank you :)

  10. dpaInc
    • 3 years ago
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    yw... :)

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