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f.3 maths (spheres)

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f.3 maths (spheres) 圖片參考：http://imgcld.yimg.com/8/n/HA00101881/o/20121228145125.jpg

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6) The volume of the sphere =(4/3) x pi x 2^3 =33.5cm3 (corr. to 3 sig. fig.) The volume of water inside the tank =18 x 4 x 8 -33.5 =542cm3 (corr. to 3 sig. fig.) 7a) The surface area of the plastic = 4 x pi x (12+3)^2 =2827.433 cm2 (corr to 3 d.p.) 7b) The volume of plastic =(4/3) x pi x (12+3)^3 - (4/3) x pi x 12^3 =6898.937 cm3 (corr to 3 d.p.)

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