The volume of a cylinder (this formula is given to you in the beginning of every math section) is:

So if the volume of a particular cylinder is 100 cm^3, you know this:

Now apply what the question says to what you know. Cut the radius in half and double the height:

But wait—we can substitute! We already know the top half of that fraction equals 100:

from Tumblr https://ift.tt/2lK7DvR

via IFTTT