xRAWRRx3
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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xRAWRRx3
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dw:1337896626150:dw

dpaInc
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triangle ABC is a 454590 triangle. since the area is 18, BC = 6. so AC=6sqrt2 by similarity to the 454590 triangle.

xRAWRRx3
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how'd you get that BC = 6?

dpaInc
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you agree that ABC is a 454590 triangle?

xRAWRRx3
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yup.

dpaInc
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then this is a square with area 36...dw:1337897103553:dw

dpaInc
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so BC=6

xRAWRRx3
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ohhh, okay.

xRAWRRx3
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OHHH. OKAY :) thank you :)

dpaInc
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yw... :)