How to calculate the height of a trapezoid without area? Or how to calculate the area of a trapezoid if the B and two diagonals are given?

So the question ask on how to calculate the height of the trapezoid without its area, so in that matter, you can use the formula of the perimeter which is height times (base1 + base2) / 2. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification