SohCahToa couldn't figure it out without the angle θ

[NeedHelp12]

Homework Statement

Homework Equations

Sin θ = Opp/Hyp
Cos θ = Adj/Hyp

The Attempt at a Solution

I tried to reverse it, but I couldn't figure it out without the angle θ

 

[frogjg2003]

What about the Pythagorean Theorem?

 

[NeedHelp12]

I need help solving...

 

[frogjg2003]

What is the Pythagorean Theorem?

 

[jey1234]

I need help solving...

What frogjg said. The Pythagorean Theorem says that when you have a right angled triangle like the one in your picture. The length of the longest side squared is equaled to the sum of the squares of the shorter sides.

Mathematically, (if "a" is the hypotenuse and "b" and c" are the shorter sides)

a² = b² + c²

Should be pretty straight forward from here on.

First figure out what is your "a" ,"b" and c".

If you don't understand the theorem, this video might be useful: http://www.khanacademy.org/math/algebra/ck12-algebra-1/v/pythagorean-theorem