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#1

$Old$ November 2nd, 2009, 09:41 PM

wenatchee $wenatchee is offline$

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A radiologists uses a gamma ray to treat a tumor that is 3.2cm beneth the skin.The ray is directed into the skin at a 48degree angle. How far does the ray travel before it hits the tumor?

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#2

$Old$ November 2nd, 2009, 09:44 PM

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A radiologists uses a gamma ray to treat a tumor that is 3.2cm beneth the skin.The ray is directed into the skin at a 48degree angle. How far does the ray travel before it hits the tumor?

I'd say that the side opposite the $48^\circ$ angle is 3.2cm...

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#3

$Old$ November 2nd, 2009, 09:48 PM

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$Cos(48^{\circ}) = \frac{3.2}{r}$

$r = \frac{3.2}{Cos(48^{\circ})}$

$r = 4.78$

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