A heptagon can be divided into how many triangles by drawing all the diagonals from one vertex

We’re gonna need a picture to refer to in order to figure it out. try reposting your question with the picture included.

Volume is length times width times height so
20 times 8 times 30 which is 4,800
surface area is ph (p is perimeter of base), h is height.
so perimeter would be length+length+width+width so 20+20+8+8 which is 56. so multiply 56 times 30 which is 1680. hope this !