42. IE •• A circular piece is cut from an aluminum sheet at room temperature.

(a) When the sheet is then placed in an oven, will the hole (1) get larger,

(2) get smaller, or (3) remain the same? Why?

(b) If the diameter of the hole is 8.00 cm at 20 °C and the temperature of the oven is 150 °C, what will be the new area of the hole?