The volume of the prism is 4,200 cubic centimeters.
How to find the volume?
The volume is given by the formula:
V = base area×height
We know that the height is 20cm.
And for the base area, we can see that each triangle has an area of 35cm², and there are 6 of these triangles in the base, so the total base area is 6*35cm² = 210cm²
Then the volume is:
V = 20cm* 210cm² = 4,200cm³