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3. Gold, which has a mass of 19.32 g for each cubic centimeter of volume, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber.

(a) If a sample of gold, with a mass of 33.16 g, is pressed into a leaf of 2.400 µm thickness, what is the area of the leaf?

___m2

(b) If, instead, the gold is drawn out into a cylindrical fiber of radius 1.000 µm, what is the length of the fiber?

___m

I don't understand what to use please help.