Using the pythogorean theorem, a^2 + b^2 = c^2. I can substitute the values into it, 24^2+7^2=c^2. I simplify the equation and get c^2=625, which is c=25. I'm only learning trig this year, so I don't think I'm qualified to help you after this. But, here's a nice website, I found for sin,cos,tan,cot,etc. That I think can help u. If I'm missing something please tell me. Please keep in mind this answer might be wrong and this is only my second time answering.