An onion slice shows 4 circular layers with radii:[list][*]2 cm, 4 cm, 6 cm, 8 cm[br][/*][br][/list]Find:[br][list=1][br][*][br]The area of each circle[/*][/list][br]
[list=1][*]2. [br]The area of each ring (layer)[br][/*][br][/list]
[list=1][*]3[br]The total area of the onion slice[/*][/list]