a right clinder is cut parallel to its base. what is  the shape of the two dimensionals cross section created is

What is the cross sectional area of a cylindrical disk with diameter 40 mm and thickness 2 mm please provide equation as well.

Let f(t) be the weight (in grams) of a solid sitting in a beaker of water. Suppose that the solid dissolves in such a way that the rate of change (in grams/minute) of the weight of the solid at any time t can be determined from the weight using the forumula: f'(t) : - 3f(t)(6 + f(t)) If there is 3 grams of solid at time t = 2 estimate the amount of solid 1 second later. grams