# Thread: conical paper cup

1. ## conical paper cup

How deep is the water in a conical paper cup that is filled to half of its capacity?

Is my answer correct?

2. ## Re: conical paper cup

The answer is correct, but the proof should be general. Assume that the dimensions of the cone are R and H and the dimensions of the part occupied by water are r and h. Since these figures are similar, R / r = H / h. Write the ratio of volumes, equate it to 1/2 and find h / H.