I think I got the answer. Use at your own risk. But I think the answer is 19.21
1) We know that volume= base area x height, so 306.52= 19.4 x height.
To find the height you have to divide 306.52/19.4 which would give you the height. The height is 15.8m.
D=122 degrees, hope this helps!!
I think the answer maybe 9t+5x
