# Math Help - triangles

1. ## triangles

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?

2. Originally Posted by wenatchee
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...

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

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

$r = 4.78$

Patrick