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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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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.
how'd you get that BC = 6?

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Other answers:

you agree that ABC is a 45-45-90 triangle?
then this is a square with area 36...|dw:1337897103553:dw|
so BC=6
ohhh, okay.
OHHH. OKAY :) thank you :)
yw... :)

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