What would be the volume of this solid if the height were halved and the other dimensions were reduced proportionally? Round to the nearest whole number.
I'll leave you to do the number crunching.
This is the first time that you've made a mistake!!!
The height for the original part is 10 cm
Never mind that the solid is standing at the angle of 60 degrees.
If you cut the bottom of the solid at the angle of 30 degrees, and put that part on the top of the solid,
the height is going to be exactly 10 cm.
So, we have... V = (10 * 4 * 3) / 8
or V = 5 * 2 * 1.5
Imagine the angle was 89° (or even 90°). Do you think the volume would still be the same?
(Incidentally, I make mistakes all the time! That's why it's incumbent on all posters to check the answers themselves.)