Can Someone Explain how to slove these problems for me

1. Find the perimeter of a rhombus with diagonals of length 48 and 14

2. One leg of a right triangle is twice the length of the other. How many times as long as the smaller leg is the hypotenuse?

3. Find the length of the leg of a right triangle if one leg has length 12/7 and the hypotenuse has length of 15/7