Marni loves pancakes and likes to eat them in a tall stack. Assume that she always makes 8 pancakes with a thickness of inch. Homework Help ✎

1. Last Saturday, Marni decided to make square pancakes. If the largest pancake had an edge of 9 inches and each pancake had an edge inch shorter than the one below it, find the volume of pancakes Marni ate last Saturday.

2. Next Sunday, Marni will make circular pancakes. This time, each pancake will have a diameter 1 inch smaller than the one below it and the smallest pancake will have a radius of 2 inches. How much volume is she planning to eat?