Help with right triangles....:]?

I cannot find the area of a right triangle that has the perimeter of 24cm and the hypotenuse is 10cm, but what is the area? please help? also, i cannot find the perimeter of this right triangle that has the area of 6cm and the hypotenuse is 5cm. please help me find the perimeter of that right triangle! whoever answers correctly will be given many points if i choose you as best answer!