The friend in Exercise 82 replied, “Yes, and I have two cups that hold exactly the same amount of water, one of which is cylindrical and the other is hemispherical. If I tell you the height of the cylinder, can you tell me the radius of each, if the radii are equal?”

Data from Exercises 82

An avid math student wrote to a friend, “My sailboat has a right triangular sail with edges (in ft) of 3k − 1, 4k + 3, and 5k + 2. Can you tell me the area of the sail if k > 1?”