I need help with this question, please. I will give brainliest

Answer:
336 cm to the power of 2
Step-by-step explanation:
AB=√6 to the power of 2 plus 8 to the power of 2=√100=10cm
surface area:
12xb plus 6x8x 1/2x2 plus 128 plus 12x10
=72 plus 48 plus 9b plus 120
=336 cm to the power of 2
Hope this helps!!