How do you find volume for this triangular prism

Find the base by doing pythogrean 20.8^2-8^2= sq rt of 368.64 is 19.2

B= triangle formula 1/ 2 bh
Volume= BH
1/2(19.2)(8)(12)
Answer Volume= 921.6 m^3

The great thing about this problem is they give you everything you need to solve it easily. so the expression is: 12h+30w12h+30wand so everywhere you have an “h” you place 66. and everywhere you have a “w” you place 33. then the expression will look like this: 12(66)+30(33)12(66)+30(33)from here you multiply and then add. getting the following of: $785,862hope this