Volume of Solids Problems

[HeyImDragon]

I have no idea how to solve these problems. How do I even start? Please help!!

 

[Deleted member 4993]

I have no idea how to solve these problems. How do I even start? Please help!!

Which shape (in the given pictures) will have π in the expression of its volume?

 

[HallsofIvy]

You know that \(\displaystyle \pi\) is defined as the ratio of the circumference of a circle to its diameter, don't you? Which of the figures in those pictures reminds you of a circle?

 

[Harry_the_cat]

I have no idea how to solve these problems. How do I even start? Please help!!

I don't think you need to know anything about the formulae for the volumes of the individual shapes.

Compare the last 2 pictures. The second picture has an extra green block compared to the third picture.
Therefore the volume of the green block must be 8pi + 28 -(8pi+20) =8 cubic units.

Now compare the first and third picture. The third picture has an extra yellow block compared to the first picture.
Therefore the volume of the yellow block must be ???

See if you can finish it off from there.