GRADE 10 MATH EXAM TOMORROW, (things i really need help with!)?

Do you know the formula? Hypotenuse squared= A squared + B squared.. So if you're trying to find the longest side you, add them together and if you're trying to find the shortest side you have to take away, once you have your answer you square root it :) I'm not sure about the angles.. Don't you have to add the numbers up and take away by 360? Anyway, I'm not quite sure, good luck though!