lana.831
The length of arc AB = 9π and m∠AOB = 150°. What is the length of the radius of the circle?



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lana.831
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lana.831
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@RadEn can you help me, please?

RadEn
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use the proportion :
150/360 = arc AB/circumference circle
150/360 = 9π/2πr
5/12 = 9/2r
solve for r

HAPPY10
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9? = 2?r(150/360) r = 10.8 unites 2? = (1/2)(x)3^2, where x is the measure of ?COD in rad. x = 4?/9 rad = 80 degrees im for sure

lana.831
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dw:1365446535715:dw

lana.831
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@RadEn is that right?

RadEn
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correct!

HAPPY10
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yes mam

robtobey
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Solve the following for r, the radius.\[\pi 2 r=\frac{360\ 9 \pi }{150} \]r = 10.8

lana.831
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thank you!

HAPPY10
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np