How to calculate the perimeter of a romb having 2 cm and 4 cm diagonals?

Perimeter is the out side to think the outside of a rug and area in the inside so the outline of you room all you have to do is add the numbers given you can me only two numbers but let’s say you have a square that has 4 written on each side add 4 four times so 4+4+4+4=16 got it?