Use the net below.

288cm
312cm
336cm
368cm

Volume;
8*6 = 48
48/2 = 24

24*12 = 288 cm³

The volume of the shape would be 288 cm³

Surface Area;
6*8 = 48
48/2 = 24

12*8 = 96
12*10 = 120
6*12 = 72

(24*2)+96+120+72 = 336 cm²

The surface Area of the shape would be 336 cm²

Hope this helps! :)

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there

Answer: 900°

good luck on your studies! : )

david edward.